A statistic question.?

2010-07-07 8:59 am

Picking 5 cards out of 52 cards, how many different hands consisting of three kings and two queens are possible?
Pls help me.

回答 (1)

2010-07-07 9:32 am

✔ 最佳答案

# of specified hands

= [from 4 kings, choose 3] * [from 4 queens, choose 2]

= 4c3 * 4c2

= (4!/3!1!) * (4!/2!2!)

= 4*6

= 24
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