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Interview Questions

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Trader at Jane Street

27 Apr 2011

“was asked this question want buy a car at an auction whos price is uniformly distributed between 0-1000 if you bid more than the car you win it at the price you bid.if you bid less that…”

“We consider numbers from 1 to 1 million. How many digits 2 are there”

1 of 1 found helpful

“You roll two die: What is the probability of rolling a 10 and an 11 before rolling a 7?”

“If I write down all of the numbers from 1 to 1,000,000 on a page, how many times do I write down the digit 2?”

9 balls, identical in appearance. 8 are of same weight. 1 is heavier. Identify this heavier ball by using a scale twice.”

“Pretty standard question that has been asked before... keep flipping a coin until a winning combination appears (either HHT or HTT). Which strategy would you pick given the choice and why. Find the…”

“write a function that returns the first unique element in an array”

“2nd Round: You have a deck of cards, 26 red, 26 black. These are turned over, and at any point you may stop and exclaim "The next card is red.". If the next card is red you win £10.

What's the…”

“Given a list of words, right a function to return a list of pairs of palindromes”

“template<class T1; class T2; class T3>
int Product (T1 a, T2 b, T3 c)
      return a * b * c;

What is the error in the sample code above?”

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