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【OG20-P168-140题】
Clarissa will create her summer reading list by randomly choosing 4 books from the 10 books approved for summer reading. She will list the books in the order in which they are chosen. How many different lists are possible?
分析A选项
分析B选项
分析C选项
分析D选项
分析E选项
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暂无雷哥网文字解析
答案 D
【解题思路】
在10本书中，选出4本，需要排列，所以是
【知识补充】
排列：从N个不同元素中取出M(M≤N)个元素，按照一定的顺序排成一列。
187788tpjt
排列组合是A m n =n*(n-1)...*(n-m+1)吧
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2023-03-17 22:52:22
180687pkqh
有顺序 A10(4)=10*9*8*7=5040
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2022-03-30 16:17:17
你这只猪
回头再看不知道为什么原先会做错
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2020-06-17 13:34:24
Geva
首先应该是考虑用排列组合的C还是A，由于题目说需要考虑顺序（She will list the books in the order in which they are chosen），所以采用A的排列组合，A 4,10 即：1*2*3*4*5*6*7*8*9*10/1*2*3*4*5*6 = 5040
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2018-11-23 14:46:00
四个自信
分两步解，第一步先从10本书中选出4本，用组合(10*9*8*7)/4*3*2=210,第二步，选出的4本书再内部组合共有4*3*2=24种方法,第一步和第二步相乘得到答案。
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2018-11-01 21:20:28
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