99,回复：Quant面试题：喝醉了（2.5星）

来源: randommatrix 于 2009-11-14 10:37:20 [] [旧帖] [给我悄悄话] 阅读数 : (246 bytes)

First, the probability of entering the left door is almost one as n goes large.(by an induction formula).
Then it can be derived
E(n+1)=E(n)+1.
Since E(1)=0.
Then E(100)=99.














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