GMAT 数学题（17）

sdcar2010 · 发表于 2011-2-16 12:31:47

There are six gamblers (An, Bing, Cheng, Ding, Er, and Fang). Each of them rolls a fair 6-sided dice with 1,2,3,4,5, and 6 on each of the six sides, respectively. At least three of them got an even number. What is the probability that Bing, Ding and Fang all rolled an even number? Why?

zoechancruz · 发表于 2011-2-16 12:50:22

答案？是27/64吗

kazemi · 发表于 2011-2-16 13:02:46

3！*3！/6！

一生涯凡人也 · 发表于 2011-2-16 13:11:24

我算的是 21/640 . 我也不确定对不对。从6个人选他们3个概率是 1/20. 至少有三个人的是偶数的概率和是 21/32. 相乘得出21/640. 不知道对不对。

hucongzi722 · 发表于 2011-2-16 13:28:11

8/15 ？

sdcar2010 · 发表于 2011-2-16 21:26:43

Thanks for all the participation. Keep trying. The right answer has not surfaced yet.

Hints:
The pool is not 6! because "At least three of them got an even number."

kazemi · 发表于 2011-2-16 22:47:49

嗯...再看了遍题目，发现昨天看错了，语法看多了的后遗症...

kazemi · 发表于 2011-2-16 23:09:02

(3^3*6^3)/(3^3*6^3+3^4*6^2+3^5*6^1+3^6*6^0)

kazemi · 发表于 2011-2-16 23:14:19

囧~~算出来的和4楼的一样，按楼主的意思就是错了...还是等楼主公布答案吧，上班去了

nonentity · 发表于 2011-2-17 00:51:21

1/8?

GMAT 数学题（17）

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