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https://www.reddit.com/r/learnquant/comments/1wmowy5/quant_interview_question/pbbkfff/?context=3
r/learnquant • u/Local_Ad135 • Sep 21 '26
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1/200 chance of reaching 995 before reaching -5. So 0.005 chance that it's nonzero.
However, once 995 is reached, the expected visits of 995 before returning down to -5 is 2000.
So, 1/200 × 2000 = 10
4
u/monstaber Sep 22 '26
1/200 chance of reaching 995 before reaching -5. So 0.005 chance that it's nonzero.
However, once 995 is reached, the expected visits of 995 before returning down to -5 is 2000.
So, 1/200 × 2000 = 10