题目:
从5名男生和4名女生中选出4人参加学校辩论赛.
(Ⅰ)如果4人中男生和女生各选2人,有多少种选法?
(Ⅱ)如果男生中的甲和女生中的乙至少有1人在内,有多少种选法?
答案:
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I sometimes argue with my mother about if I can watch TV after school. She whetherholds the view which senior students have to devote all their time to work hard at ...