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7个人排成一排准备照一张合影.其中甲.乙要求相邻.丙.丁要求分开.则不同的排法有( )A.
7个人排成一排准备照一张合影.其中甲.乙要求相邻.丙.丁要求分开.则不同的排法有( )A.
发布时间:2021-02-22 09:46:22
5、7个人排成一排准备照一张合影,其中甲、乙要求相邻,丙、丁要求分开,则不同的排法有( )
A、480种
B、720种
C、960种
D、1200种
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答案:
分析:
本题是一个分步计数问题,甲、乙要求相邻,则把甲和乙看成一个元素,与除去丙和丁以外的共4个元素进行全排列,其中甲和乙之间还有一个排列,根据丙和丁不相邻,把形成的五个空选两个排列丙和丁.得到结果.
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