My calcuation of (2) is: C(3,5)/C(5,10)=5/126
所有跟帖:
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你忘了对4个,对五个了。嘻嘻
-mom2016-
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02/27/2014 postreply
19:23:14
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Then that shoud be 16/252
-qtzhao-
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02/27/2014 postreply
19:31:33
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Then that shoud be 16/ 2^5
-Mom2016-
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02/27/2014 postreply
19:42:56