Questions d'entretiens - Quantitative investment analyst


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Goldman Sachs
On a demandé à un Summer Internship - Quantitative Investment Strategies...10 avril 2012

Suppose that you have a fair coin. You start with $0. You win 1$ each time you get a head and loose $1 each time you get tails. Calculate the probability of getting $2 without getting below $0 at any time.

6 réponses


1/3 Because if he requires 2 heads = $2, then it means he require HH out of {HH,HT ,TH,TT} We cannot consider TT because it would turn to zero. Therefore, he has 1 chance out of 3. Hence 1/3. Moins

Marchov chain with 2 and -1 absorbing OR geometric series 1/4^n from 1 to inf=1/3 Moins

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There are 25 horses and a track where you can race 5 of them at a time. What is the minimum number of races needed in order to find the top 3 horses?

1 réponses

It took me a while to get the correct answer which is 7 races.

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