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[Problem Solving]
试题详情
题目:
A certain restaurant offers 6 kinds of cheese and 2 kinds of fruit for its dessert platter. If each dessert platter contains an equal number of kinds of cheese and kinds of fruit, how many different dessert platters could the restaurant offer?
选项:
A、 8
B、 12
C、 15
D、 21
E、 27
答案:
E
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提问:
两种东西的种类要相同,由于B东西只有2种,要么B取一个A东西取一个,要么就是B取2,A也取2。所以6个里面取2个有15种,2个里面取2个有1种,15*1=15,请问老师答案27是怎么得到的,谢谢
解答:
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解答: sysadmin
提问:
陆旭老师啊麻烦啦还要问这么简单的问题,用盒子法解这题难道不是6*2/2!+6*5*2/4!因为顺序不重要嘛谢谢老师
解答:
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解答:
陆旭老师
提问:
两种东西的种类要相同,由于B东西只有2种,要么B取一个A东西取一个,要么就是B取2,A也取2。所以6个里面取2个有15种,2个里面取2个有1种,15*1=15,请问老师答案27是怎么得到的,谢谢
解答:
点赞0
阅读2150
解答: sysadmin老师
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