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Hal has 4 girl friends and 5 boy friends. In how many different ways can Hal invite 2 girls and 2 boys to his birthday party?
Hal has 4 girl friends and 5 boy friends. In how many different ways can Hal invite 2 girls and 2 boys to his birthday party?
admin
2019-05-11
106
问题
Hal has 4 girl friends and 5 boy friends. In how many different ways can Hal invite 2 girls and 2 boys to his birthday party?
选项
A、54
B、60
C、72
D、120
E、240
答案
B
解析
第一步选择女孩,从4个人里面选择24个人C
4
2
;第二步选择男孩,从5个人里面选择2个人C
5
2
。
根据乘法原理可以得出C
4
2
×C
5
2
=60。所以答案为B选项。
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