蓝皮书27题

yunfei306 · 发表于 2008-9-8 23:00:00

27. A coin that is tossed will land heads or tails, and each outcome has equal probability. What is the probability that the coin will land heads at least once on two tosses?

A. 1/4

B.1/3

C.1/2

D.2/3

E.3/4

怎么求这道题？谢谢

rorochen · 发表于 2008-9-8 23:09:00

at least once on two tosses==〉1- 1/2* 1/2 =3/4 选e, 1-一次都没有是head这一面的情况

yunfei306 · 发表于 2008-9-9 10:44:00

谢谢了

蓝皮书27题

蓝皮书27题

所属分类: GMAT考试

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