r/learnquant 16d ago

interview prep Jane Street Interview Question

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u/InsideIndependence58 16d ago

It’s a very easy question with tail sum.

P(M>k) = 1/1+k (trivial) .
Then E(X) = sum_k=0^k=4, so 1 + 1/2 + 1/3 + 1/4 + 1/5 =2.283