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Difficulty: 800 – 2200

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	#	Name	Tags	Difficulty	Solved by
✓	dn_s27_q001	Ants on triangle collision 150 Most Frequently Asked Questions on Quant Interviews (Stefanica, Radoicic, Wang) · Ch 2 · Questions	brainteaser combinatorics fibonacci	1700	x0
✓	dn_s27_q011	Cube cut into 1000 cubes 150 Most Frequently Asked Questions on Quant Interviews (Stefanica, Radoicic, Wang) · Ch 2 · Questions	brainteaser geometry combinatorics	1300	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_q018	Arrange numbers 1..2015 cycle equal sums 150 Most Frequently Asked Questions on Quant Interviews (Stefanica, Radoicic, Wang) · Ch 2 · Questions	brainteaser combinatorics alternating-sum	1900	x0
✓	gb_ch02_q011	Box packing Green Book · Ch 2 · Brain Teasers	brain-teaser combinatorics parity coloring	1700	x0
✓	gb_ch02_q033	Coin split problem Green Book · Ch 2 · Brain Teasers	brain-teaser induction invariant combinatorics	1500	x0
✓	gb_ch04_q002	Card game Green Book · Ch 4 · Probability Theory	probability symmetry card-game combinatorics	1400	x0
✓	gb_ch04_q005	Poker hands Green Book · Ch 4 · Probability Theory	probability combinatorics poker card-game	1200	x0
✓	gb_ch04_q006	Hopping rabbit Green Book · Ch 4 · Probability Theory	combinatorics recursion fibonacci induction	1100	x0
✓	gb_ch04_q007	Screwy pirates 2 Green Book · Ch 4 · Probability Theory	combinatorics secret-sharing cryptography	1700	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_q019	Dice order Green Book · Ch 4 · Probability Theory	probability dice combinatorics	1100	x0
✓	gb_ch04_q025	Aces Green Book · Ch 4 · Probability Theory	probability combinatorics card-game conditional	1500	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_q030	Two red socks probability 1/2 An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 1 · Interviews	probability combinatorics diophantine	1500	x0
✓	rb_ch01_q017	Safe combination 40 brute force Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions	combinatorics counting puzzle	1400	x0
✓	rb_ch01_q038	20x20 chessboard cube pattern Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions	combinatorics summation	1700	x0
✓	rb_ch01_q060	Lattice paths coordinate Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions	combinatorics lattice-paths	1400	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_q031	Red Book (Heard on the Street) · Ch 4 · Statistics Questions	combinatorics stars-and-bars	1700	x0

1	inderjeet230502	1218
2	kalash.kankaria	1205