Question bank

• FreeBrainteaserEasy

  A Fair Coin from a Biased One

  Asked atJane StreetOptiver
• FreeMarket makingEasy

  Make Me a Market on a Coin Game

  Asked atOptiverIMCSIG
• FreeProbabilityMedium

  Breaking a Stick into a Triangle

  Asked atCitadelSIGFive Rings
• FreeBrainteaserEasy

  Ants on a Triangle

  Asked atAkuna CapitalIMC
• PremiumProbabilityHard

  Returning to the Origin

  Asked atHudson River TradingJane Street
• PremiumStatisticsMedium

  Why Your Beta Is Too Small

  Asked atTwo SigmaCitadel九坤投资 Ubiquant
• PremiumProbabilityMedium

  Uniforms Until the Sum Exceeds One

  Asked atFive RingsJump Trading
• PremiumCodingMedium

  Counting Inversions in an Array

  Asked atCitadel SecuritiesJane StreetDRW
• PremiumMachine learningMedium

  A Model That Backtests Beautifully

  Asked atJump TradingTwo Sigma幻方量化 High-Flyer
• PremiumBrainteaserHard

  One Hundred Prisoners and One Hundred Boxes

  Asked atOptiverIMCSIG
• FreeStatisticsEasy

  Expected Maximum of n Uniforms

  Asked atJane StreetAkuna Capital
• PremiumProbabilityHard

  The Two Envelopes Argument

  Asked atCitadelHudson River Trading

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