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A gardener wishes to plant 5 bushes in a straight row. Each bush has flowers of a different solid color (white, yellow, pink, re
A gardener wishes to plant 5 bushes in a straight row. Each bush has flowers of a different solid color (white, yellow, pink, re
admin
2009-05-19
74
问题
A gardener wishes to plant 5 bushes in a straight row. Each bush has flowers of a different solid color (white, yellow, pink, red, and purple). How many ways can the bushes be arranged so that the middle bush is the one with red flowers?
选项
A、24
B、30
C、60
D、96
E、120
答案
A
解析
一名园丁想将5种花丛种成一直排,每种花丛开不同颜色的花(白色、黄色、粉红、红色和紫色),有多少种种植方法可使中间的一种为开红色花的花丛?
解:本题的正确答案为(A)。5个元素中第3个为红色,另外4个为剩下的4种颜色,所以本题安排为24种。
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