请问这题数学怎么做？

chriyen · 发表于 2013-8-19 23:23:38

Every trading day, the price of CF Corp stock either goes up by $1 or goes down by $1 with equal likelihood. At the end of 5 trading days, what is the probability that the price of CF Corp stock is up byexactly $3 from its initial price?
a 1/16 b1/8 c 5/32d 9/32e3/8

frefea · 发表于 2013-8-19 23:48:53

C(1 5)/2^5

滨崎步祝 · 发表于 2013-8-19 23:54:02

是C吗？

请问这题数学怎么做？

所属分类: GMAT考试

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