Brainteasers Essentials
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- FlashlightProbability
- Clocks and HandsReasoning
- Subscribe to unlock all brainteasersFour of a KindProbability
- Subscribe to unlock all brainteasersFaulty RobotReasoning
- Boys and Girls in a RowProbability
- Subscribe to unlock all brainteasersGender RatioProbability
- Subscribe to unlock all brainteasersFour CardsReasoning
- Just NormalProbability
- Subscribe to unlock all brainteasersCrash CourseProbability
- Animals in a CageMath
- Subscribe to unlock all brainteasersElementsProbability
- Subscribe to unlock all brainteasersBullseyeProbability
- HourglassesReasoning
- Subscribe to unlock all brainteasersFermi: Tennis ballsReasoning
- Ice cream and StudentsProbability
- Subscribe to unlock all brainteasersNewbornProbability
- Subscribe to unlock all brainteasersMax and Mark's AgesMath
- Birthday MonthReasoning
- Subscribe to unlock all brainteasersBiased CoinsProbability
- Easy HedgeOption Theory
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Sign upAlready have an account? Log inFrequently Asked Questions
The Essentials Collection contains foundational brainteasers and quant interview questions that every aspiring trader should know. These questions cover fundamental concepts in probability, logic, and quantitative reasoning that form the building blocks for more advanced problems. Mastering these is crucial before moving on to harder material.
We recommend working through these brainteasers systematically. Start with the easier questions sorted by difficulty to build a solid foundation. Focus on truly understanding the solution approach rather than memorizing answers, as interviewers often ask follow-up questions or variations. Practice explaining your thought process out loud, as communication is key in trading interviews.
Yes, we strongly recommend completing the Essentials Collection first. These foundational brainteasers develop the core problem-solving skills and quantitative intuition needed for harder quant interview questions. Once you're comfortable with these, you'll find the more advanced collections like the Top 50 and Cards & Coins much more approachable.