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Difficulty: 800 – 2200

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	#	Name	Tags	Difficulty	Solved by
✓	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_q003	Bunch of vectors in R An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	r matrices	900	x0
✓	qip_q004	Python negative indexing mylist[-1] An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	python indexing	800	x0
✓	qip_q005	C++ virtual functions An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	c++virtual polymorphism	1100	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_q007	Find missing number in unsorted array An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	algorithm arrays sum binary-search	1500	x0
✓	qip_q008	Sample mean and variance distribution An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	statistics sampling-distribution chi-squared	1700	x0
✓	qip_q009	Derivative of inverse function An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	calculus inverse-function	1300	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_q014	Linear regression assumptions and tests An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	statistics regression ols	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_q016	Derivative of x^x An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	calculus logarithmic-differentiation	1100	x0
✓	qip_q017	Compare e^pi vs pi^e An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	calculus monotonicity	1400	x0
✓	qip_q018	AR(1) mean and variance An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	time-series ar1 stationarity	1500	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_q022	Check anagrams with/without sorting An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	coding strings anagram	1100	x0
✓	qip_q023	nCr without standard library An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	coding combinatorics recursion	1200	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_q025	Find Beckham via 'knows' function (adjacency matrix) An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	algorithm graph celebrity-problem	1700	x0
✓	qip_q026	Unique integer except one in array An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	algorithm arrays hashing	1300	x0
✓	qip_q027	n bandits — favorite sorting algorithm An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	algorithm sorting complexity	1300	x0
✓	qip_q028	Significance tests in logistic vs linear An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	statistics logistic-regression hypothesis-testing	1500	x0
✓	qip_q029	Two wood pieces — minimize variance with 2 measurements An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	statistics design variance-reduction	1800	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_q031	Linear regression assumptions and multicollinearity An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	statistics regression multicollinearity	1400	x0
✓	qip_q032	Non-linear models An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	statistics non-linear-models	1100	x0
✓	qip_q033	SQL: average department salary and second-highest salary An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	sql window-functions subquery	1300	x0
✓	qip_q034	SQL: customers who changed details An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	sql group-by	1300	x0
✓	qip_q035	Linear vs logistic regression assumptions & significance tests An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	statistics regression logistic-regression	1500	x0
✓	qip_q036	R data structures, merging data frames, lapply vs for loop An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	r data-structures functional	1100	x0
✓	qip_q037	Specific team problem — model recommendation An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	modeling interview-soft	1300	x0
✓	qip_q038	Random walk hit l before 0 An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	random-walk gamblers-ruin martingale	1500	x0
✓	qip_q039	First to say 50 game An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	game-theory nim-like induction	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_q041	Bag of coins, one double-headed An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	bayes conditional coins	1600	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
✓	qip_q044	Linear regression derivation An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 3 · Regression theory	statistics ols derivation	1500	x0
✓	qip_q045	Simple linear regression — derive beta_hat An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 3 · Regression theory	statistics simple-regression ols	1300	x0
✓	qip_q046	Logistic regression — log-likelihood and MLE An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 3 · Regression theory	statistics logistic-regression mle iterative	1700	x0

1	inderjeet230502	1218
2	kalash.kankaria	1205