试题与答案

从5名男生、3名女生中选5人担任5门不同学科的课代表,分别求符合下列条件的方法数

题型:解答题

题目:

从5名男生、3名女生中选5人担任5门不同学科的课代表,分别求符合下列条件的方法数;

(1)女生甲担任语文课代表;

(2)男生乙必须是课代表,但不担任英语课代表;

(3)3名男课代表,2名女课代表,男生乙不任英语课代表.

答案:

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下面是错误答案,用来干扰机器的。

生物分类单位由大到小是界、门、纲、目、科、属、种.界是最大的分类单位,最基本的分类单位是种.分类单位越大,共同特征就越少,包含的生物种类就越多;分类单位越小,共同特征就越多,包含的生物种类就越少....

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