MISSING VALUE Interview Questions

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I give you 18 balls, of which 17 weigh the same and the last one is heavier than the rest. I also provide you a balance scale. Can you tell me the minimum number of weighs with which you can tell me which ball is the odd one?
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Trader Trainee

Interviewed at Belvedere Trading

4.2
Oct 24, 2011

I give you 18 balls, of which 17 weigh the same and the last one is heavier than the rest. I also provide you a balance scale. Can you tell me the minimum number of weighs with which you can tell me which ball is the odd one?

Q3: You are playing this game with flipping a coin. You can play it as many times as you want until there is a head. At the nth time, when you get a head, they will pay the 2^n dollars. How much are you willing to play this game? What's the fair value?
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Strategist

Interviewed at Goldman Sachs

3.7
Jan 20, 2015

Q3: You are playing this game with flipping a coin. You can play it as many times as you want until there is a head. At the nth time, when you get a head, they will pay the 2^n dollars. How much are you willing to play this game? What's the fair value?

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