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	#	Name	Tags	Difficulty	Solved by
✓	dn_s26_q001	Exponential distribution 150 Most Frequently Asked Questions on Quant Interviews (Stefanica, Radoicic, Wang) · Ch 2 · Questions	probability exponential	1000	x0
✓	dn_s26_q002	Sum of independent exponentials greater than X 150 Most Frequently Asked Questions on Quant Interviews (Stefanica, Radoicic, Wang) · Ch 2 · Questions	probability exponential independence	1400	x0
✓	dn_s26_q003	Mean and variance of Poisson 150 Most Frequently Asked Questions on Quant Interviews (Stefanica, Radoicic, Wang) · Ch 2 · Questions	probability poisson	900	x0
✓	dn_s26_q004	Point uniformly in unit disk 150 Most Frequently Asked Questions on Quant Interviews (Stefanica, Radoicic, Wang) · Ch 2 · Questions	probability geometric	1300	x0
✓	dn_s26_q005	Conditional probability X<Y given uniforms 150 Most Frequently Asked Questions on Quant Interviews (Stefanica, Radoicic, Wang) · Ch 2 · Questions	probability joint-normal conditional	1700	x0
✓	dn_s26_q006	Lognormal product 150 Most Frequently Asked Questions on Quant Interviews (Stefanica, Radoicic, Wang) · Ch 2 · Questions	probability lognormal	1100	x0
✓	dn_s26_q007	Normal CDF related to Phi 150 Most Frequently Asked Questions on Quant Interviews (Stefanica, Radoicic, Wang) · Ch 2 · Questions	probability normal cdf	1700	x0
✓	dn_s26_q008	Law of large numbers 150 Most Frequently Asked Questions on Quant Interviews (Stefanica, Radoicic, Wang) · Ch 2 · Questions	probability concepts lln	1100	x0
✓	dn_s26_q009	Central limit theorem 150 Most Frequently Asked Questions on Quant Interviews (Stefanica, Radoicic, Wang) · Ch 2 · Questions	probability concepts clt	1100	x0
✓	dn_s26_q010	Martingale and option pricing 150 Most Frequently Asked Questions on Quant Interviews (Stefanica, Radoicic, Wang) · Ch 2 · Questions	probability martingale option-pricing	1500	x0
✓	dn_s26_q030	Density of standard normal integrand 150 Most Frequently Asked Questions on Quant Interviews (Stefanica, Radoicic, Wang) · Ch 2 · Questions	probability normal gaussian-integral	1500	x0
✓	dn_s27_q002	Box of pancakes probability uphill 150 Most Frequently Asked Questions on Quant Interviews (Stefanica, Radoicic, Wang) · Ch 2 · Questions	brainteaser probability conditional	1300	x0
✓	dn_s27_q003	Heads vs tails - Alice/Bob coin flips 150 Most Frequently Asked Questions on Quant Interviews (Stefanica, Radoicic, Wang) · Ch 2 · Questions	brainteaser probability symmetry	1700	x0
✓	dn_s27_q004	Restaurant coin flip biased 150 Most Frequently Asked Questions on Quant Interviews (Stefanica, Radoicic, Wang) · Ch 2 · Questions	brainteaser probability fair-from-biased	1400	x0
✓	dn_s27_q005	Coin toss expected tosses to get heads 150 Most Frequently Asked Questions on Quant Interviews (Stefanica, Radoicic, Wang) · Ch 2 · Questions	brainteaser probability expected-value	1000	x0
✓	dn_s27_q006	Coin tosses expected sequence head tail 150 Most Frequently Asked Questions on Quant Interviews (Stefanica, Radoicic, Wang) · Ch 2 · Questions	brainteaser probability expected-value states	1500	x0
✓	dn_s27_q007	Biased coin biased with 25% prob heads 150 Most Frequently Asked Questions on Quant Interviews (Stefanica, Radoicic, Wang) · Ch 2 · Questions	brainteaser probability expected-value	1100	x0
✓	dn_s27_q008	Fibonacci-like fair coin tossing 150 Most Frequently Asked Questions on Quant Interviews (Stefanica, Radoicic, Wang) · Ch 2 · Questions	brainteaser probability fibonacci	1900	x0
✓	dn_s27_q015	Pick two distinct elements from set 150 Most Frequently Asked Questions on Quant Interviews (Stefanica, Radoicic, Wang) · Ch 2 · Questions	brainteaser combinatorics probability	1500	x0
✓	dn_s27_q016	Alice writes two distinct numbers 150 Most Frequently Asked Questions on Quant Interviews (Stefanica, Radoicic, Wang) · Ch 2 · Questions	brainteaser probability strategy	1800	x0
✓	gb_ch04_q001	Coin toss game Green Book · Ch 4 · Probability Theory	probability symmetry coin-toss	1400	x0
✓	gb_ch04_q002	Card game Green Book · Ch 4 · Probability Theory	probability symmetry card-game combinatorics	1400	x0
✓	gb_ch04_q003	Drunk passenger Green Book · Ch 4 · Probability Theory	probability symmetry classic	1500	x0
✓	gb_ch04_q004	N points on a circle Green Book · Ch 4 · Probability Theory	probability geometric-probability symmetry	1700	x0
✓	gb_ch04_q005	Poker hands Green Book · Ch 4 · Probability Theory	probability combinatorics poker card-game	1200	x0
✓	gb_ch04_q008	Chess tournament Green Book · Ch 4 · Probability Theory	probability tournament combinatorics conditional	1600	x0
✓	gb_ch04_q009	Application letters Green Book · Ch 4 · Probability Theory	probability combinatorics inclusion-exclusion derangement	1500	x0
✓	gb_ch04_q010	Birthday problem Green Book · Ch 4 · Probability Theory	probability birthday-problem classic	1100	x0
✓	gb_ch04_q012	Cubic of integer Green Book · Ch 4 · Probability Theory	number-theory modular-arithmetic probability	1500	x0
✓	gb_ch04_q013	Boys and girls Green Book · Ch 4 · Probability Theory	probability conditional bayes classic	1400	x0
✓	gb_ch04_q014	All-girl world? Green Book · Ch 4 · Probability Theory	probability expectation common-misconception independence	1300	x0
✓	gb_ch04_q015	Unfair coin Green Book · Ch 4 · Probability Theory	probability bayes conditional	1300	x0
✓	gb_ch04_q016	Fair probability from an unfair coin Green Book · Ch 4 · Probability Theory	probability symmetry construction classic	1300	x0
✓	gb_ch04_q017	Dart game Green Book · Ch 4 · Probability Theory	probability symmetry order-statistics	1500	x0
✓	gb_ch04_q018	Birthday line Green Book · Ch 4 · Probability Theory	probability birthday-problem optimization conditional	1700	x0
✓	gb_ch04_q019	Dice order Green Book · Ch 4 · Probability Theory	probability dice combinatorics	1100	x0
✓	gb_ch04_q020	Monty Hall problem Green Book · Ch 4 · Probability Theory	probability conditional monty-hall classic	1300	x0
✓	gb_ch04_q021	Amoeba population Green Book · Ch 4 · Probability Theory	probability branching-process total-probability	1700	x0
✓	gb_ch04_q022	Candies in a jar Green Book · Ch 4 · Probability Theory	probability conditional symmetry ordering	1700	x0
✓	gb_ch04_q023	Coin toss game (HT sequence) Green Book · Ch 4 · Probability Theory	probability conditional coin-toss recursion	1700	x0
✓	gb_ch04_q024	Russian roulette series Green Book · Ch 4 · Probability Theory	probability conditional strategy decision-theory	1900	x0
✓	gb_ch04_q025	Aces Green Book · Ch 4 · Probability Theory	probability combinatorics card-game conditional	1500	x0
✓	gb_ch04_q026	Gambler's ruin problem Green Book · Ch 4 · Probability Theory	probability random-walk gamblers-ruin recursion	1700	x0
✓	gb_ch04_q027	Basketball scores Green Book · Ch 4 · Probability Theory	probability induction polya-urn recursion	1900	x0
✓	gb_ch04_q028	Cars on road Green Book · Ch 4 · Probability Theory	probability independence poisson	1100	x0
✓	gb_ch04_q029	Meeting probability Green Book · Ch 4 · Probability Theory	probability geometric-probability uniform-distribution	1300	x0
✓	gb_ch04_q030	Probability of triangle Green Book · Ch 4 · Probability Theory	probability geometric-probability uniform-distribution	1500	x0
✓	gb_ch04_q031	Property of Poisson process Green Book · Ch 4 · Probability Theory	probability poisson-process memorylessness inspection-paradox	1700	x0
✓	gb_ch04_q032	Moments of normal distribution Green Book · Ch 4 · Probability Theory	probability normal-distribution moments mgf	1300	x0
✓	gb_ch04_q033	Connecting noodles Green Book · Ch 4 · Probability Theory	probability expectation recursion induction	1900	x0
✓	gb_ch04_q034	Optimal hedge ratio Green Book · Ch 4 · Probability Theory	probability finance variance optimization hedging	1300	x0
✓	gb_ch04_q035	Dice game Green Book · Ch 4 · Probability Theory	probability expectation total-expectation dice	1300	x0
✓	gb_ch04_q036	Card game (aces position) Green Book · Ch 4 · Probability Theory	probability expectation indicator-variables card-game	1500	x1
✓	gb_ch04_q037	Sum of random variables Green Book · Ch 4 · Probability Theory	probability uniform-distribution induction geometric-probability	1900	x0
✓	gb_ch04_q038	Coupon collection Green Book · Ch 4 · Probability Theory	probability expectation coupon-collector geometric-distribution indicator-variables	1600	x0
✓	gb_ch04_q039	Joint default probability Green Book · Ch 4 · Probability Theory	probability correlation finance indicator-variables bounds	1600	x0
✓	gb_ch04_q040	Expected value of max and min Green Book · Ch 4 · Probability Theory	probability order-statistics uniform-distribution expectation	1400	x0
✓	gb_ch04_q041	Correlation of max and min Green Book · Ch 4 · Probability Theory	probability order-statistics correlation uniform-distribution	1700	x0
✓	gb_ch04_q042	Random ants Green Book · Ch 4 · Probability Theory	probability order-statistics symmetry expectation creative-bijection	1800	x0
✓	pr_ch03_q001	Two dice roll for game advantage A Primer for the Mathematics of Financial Engineering (Stefanica) · Ch 3 · Probability concepts. Black-Scholes formula. Greeks and Hedging	probability expected-value dice	1400	x0
✓	pr_ch03_q002	Two coins, two heads with probability p and 1-p A Primer for the Mathematics of Financial Engineering (Stefanica) · Ch 3 · Probability concepts. Black-Scholes formula. Greeks and Hedging	probability geometric expected-value	1100	x0
✓	pr_ch03_q003	Stock model up/down/middle over three periods A Primer for the Mathematics of Financial Engineering (Stefanica) · Ch 3 · Probability concepts. Black-Scholes formula. Greeks and Hedging	probability binomial-tree expected-value variance	1300	x0
✓	pr_ch03_q004	Exponential density parametrization A Primer for the Mathematics of Financial Engineering (Stefanica) · Ch 3 · Probability concepts. Black-Scholes formula. Greeks and Hedging	probability exponential memoryless	1100	x0
✓	pr_ch03_q005	Cauchy-Schwarz inequality A Primer for the Mathematics of Financial Engineering (Stefanica) · Ch 3 · Probability concepts. Black-Scholes formula. Greeks and Hedging	probability inequalities cauchy-schwarz	1500	x0
✓	pr_ch04_q001	Sum of normal random variables A Primer for the Mathematics of Financial Engineering (Stefanica) · Ch 4 · Lognormal random variables. Risk-neutral pricing	probability normal sum	1100	x0
✓	pr_ch04_q002	Sample average normal mean and var A Primer for the Mathematics of Financial Engineering (Stefanica) · Ch 4 · Lognormal random variables. Risk-neutral pricing	probability sample-mean variance	1200	x0
✓	qip_q001	Roll two dice — higher number probability An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	probability dice symmetry	1100	x0
✓	qip_q002	Bivariate normal expectation An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	probability joint-normal max	1700	x0
✓	qip_q006	E(X^4) for X ~ Normal(0, sigma^2) An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	probability normal moments	1400	x0
✓	qip_q010	100 coin gamble — 60+ heads An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	probability binomial normal-approximation	1500	x0
✓	qip_q011	Zero correlation but not independent An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	probability correlation independence counterexample	1500	x0
✓	qip_q012	Two urns, 5 red 5 blue — maximize winning probability An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	probability optimization urns	1500	x0
✓	qip_q013	Three judges majority correct An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	probability voting majority	1400	x0
✓	qip_q015	Disease test Bayes An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	probability bayes disease-test	1300	x0
✓	qip_q019	Z = X*Y where Y is +/-1 An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	probability normal symmetry	1400	x0
✓	qip_q020	Cov(X,Y) = 0 implies independence? An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	probability covariance independence	1300	x0
✓	qip_q021	Triangle from stick breaks An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	probability geometric triangle	1500	x0
✓	qip_q024	Romeo and Juliet meeting probability An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	probability geometric meeting	1500	x0
✓	qip_q030	Two red socks probability 1/2 An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	probability combinatorics diophantine	1500	x0
✓	qip_q040	Two cards from 52-20 deck both aces An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	probability symmetry cards	1700	x0
✓	qip_q042	Air Force One (boarding) An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 2 · Old friends	probability classic induction	1700	x0
✓	qip_q043	Stick-breaking — triangle probability (deeper) An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 2 · Old friends	probability geometric triangle	1500	x0
✓	rb_ch01_q008	Married couples no children probability Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions	probability expectation common-misconception	1100	x0
✓	rb_ch01_q031	Hotel rooms key drunk guests Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions	probability derangement inclusion-exclusion	1600	x0
✓	rb_ch01_q050	Maximize firm value uniform Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions	probability auction decision-theory	1700	x0
✓	rb_ch03_q001	St. Petersburg game Red Book (Heard on the Street) · Ch 3 · Other Financial Economics Questions	probability expectation st-petersburg-paradox	1400	x0
✓	rb_ch04_q001	Two random numbers product greater than 1/2 Red Book (Heard on the Street) · Ch 4 · Statistics Questions	probability uniform-distribution integration	1300	x0
✓	rb_ch04_q002	Red Book (Heard on the Street) · Ch 4 · Statistics Questions	probability expectation dice	1100	x0
✓	rb_ch04_q003	Four coins more heads than I Red Book (Heard on the Street) · Ch 4 · Statistics Questions	probability coin-toss symmetry	1400	x0
✓	rb_ch04_q006	(**) Exchange paradox envelopes Red Book (Heard on the Street) · Ch 4 · Statistics Questions	probability expectation exchange-paradox	1500	x0
✓	rb_ch04_q007	Red Book (Heard on the Street) · Ch 4 · Statistics Questions	probability dynamic-betting binomial	1500	x0
✓	rb_ch04_q008	Three children one apple fair coin Red Book (Heard on the Street) · Ch 4 · Statistics Questions	probability fair-allocation coin-toss	1600	x0
✓	rb_ch04_q009	Expected tosses Q4.8 Red Book (Heard on the Street) · Ch 4 · Statistics Questions	probability expectation geometric	1300	x0
✓	rb_ch04_q010	Fair coin probability 1/3 Red Book (Heard on the Street) · Ch 4 · Statistics Questions	probability simulation binary-representation	1500	x0
✓	rb_ch04_q011	Roll die until number repeats expected payoff Red Book (Heard on the Street) · Ch 4 · Statistics Questions	probability expectation birthday-problem	1200	x0
✓	rb_ch04_q012	Five cards five Kings Red Book (Heard on the Street) · Ch 4 · Statistics Questions	probability combinatorics cards	1400	x0
✓	rb_ch04_q013	(**) Let's Make a Deal Monty Hall first version Red Book (Heard on the Street) · Ch 4 · Statistics Questions	probability monty-hall conditional	1000	x0
✓	rb_ch04_q014	(**) Monty Hall random audience member Red Book (Heard on the Street) · Ch 4 · Statistics Questions	probability monty-hall random-reveal	1100	x0
✓	rb_ch04_q015	Two jars 100 marbles blindfolded Red Book (Heard on the Street) · Ch 4 · Statistics Questions	probability optimization puzzle	1200	x0
✓	rb_ch04_q016	(***) Mr 30 Mr 60 Mr 90 duel survival Red Book (Heard on the Street) · Ch 4 · Statistics Questions	game-theory probability truel	1200	x0
✓	rb_ch04_q017	Basketball down two points six seconds three-point shot Red Book (Heard on the Street) · Ch 4 · Statistics Questions	decision-theory basketball probability	1300	x0
✓	rb_ch04_q021	Russian roulette revolver six chambers two bullets consecutive Red Book (Heard on the Street) · Ch 4 · Statistics Questions	probability conditional russian-roulette	1200	x0
✓	rb_ch04_q022	Large jar 999 fair pennies one two-headed Red Book (Heard on the Street) · Ch 4 · Statistics Questions	probability bayes-theorem	1300	x0
✓	rb_ch04_q023	Four cards shuffled water earth wind fire Red Book (Heard on the Street) · Ch 4 · Statistics Questions	probability card-game	1100	x0
✓	rb_ch04_q028	Unfair coin expected tosses two heads in a row Red Book (Heard on the Street) · Ch 4 · Statistics Questions	probability expectation markov-chain	1400	x0
✓	rb_ch04_q032	(**) Chocolate chip cookies probability 90% one chip Red Book (Heard on the Street) · Ch 4 · Statistics Questions	probability poisson coupon-collector	1700	x0
✓	rb_ch04_q033	Roll fair die until game stops six expected payoff Red Book (Heard on the Street) · Ch 4 · Statistics Questions	probability expectation stopping-time	1500	x0
✓	rb_ch04_q037	Two children one is girl probability two girls Red Book (Heard on the Street) · Ch 4 · Statistics Questions	probability conditional boy-girl-paradox	1400	x0
✓	rb_ch04_q038	Two children door girl appears probability two girls Red Book (Heard on the Street) · Ch 4 · Statistics Questions	probability conditional boy-girl-paradox	1600	x0

1	inderjeet230502	1218
2	kalash.kankaria	1205