how did Madoff convince his clients to allow him to invest on their behalf.
Trade Support Interview Questions
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Expected number of coin tosses to get heads/heads.
2) Given a 100 floor building, and 2 identical eggs (with an unknown capacity to survive a fall from any floor up to floor "x" of the building), how would you minimize the number of drops you need to make in order to determine the highest floor the eggs can be safely dropped from?
There is a jar full of 10 coins. 9 are fair, and 1 has both faces showing heads. You draw a coin at random from the jar and flip it 5 times. If you flip heads 5 times in a row, what is the probability that you get heads on your next flip?
How to calculate the market capitalization from the market share of a company
A question that is Jane Street-esque would be the following: Suppose there is a game. You flip a coin again and again until you see 2 consecutive heads. What is the expected number of coin flips? Follow up: What is the expected number of tails?
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We choose 6 random numbers out of the first 12 prime numbers. What is the probability that the sum is odd
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You are blindfolded and sitting at a table with 100 quarters. Ten of the quarters are tails-up and 90 are heads up. You wish to separate the quarters into two piles, each with the same number of tails. You can flip as many as you like and the piles don't need to be the same size. How do you do it?
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