prep43,帮我看看该怎么做，答案是E

predy1

43.   5768-!-item-!-187;#058&004705

A committee of three people is to be chosen from four married couples.  What is the number of different committees that can be chosen if two people who are married to each other cannot both serve on the committee?

 

(A)  16

(B)  24

(C)  26

(D)  30

(E)  32

hsn

从4对中任选3对，然后从3对中的每一对中任选其一，4*2*2*2=32

predy1

哇~ 明白了 ~感谢~~

junqianguo