Question

Centerville Middle School 国际象棋队由两名男生和三名女生组成。一位摄影师想为当地报纸拍一张队伍照片。她决定让他们坐成一排，两端各坐一名男生，中间坐三名女生。这样的排列有多少种？

The Centerville Middle School chess team consists of two boys and three girls. A photographer wants to take a picture of the team to appear in the local newspaper. She decides to have them sit in a row with a boy at each end and the three girls in the middle. How many such arrangements are possible?

$2$

$4$

$5$

$6$

$12$

答案：E

知识点：排列乘法原理

难度评级：770

视频讲解：

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文字解答：

两名男生坐在两端有 $2! = 2$ 种方式。三名女生坐在中间三个座位有 $3! = 6$ 种方式。

因此总排列数为 $2\cdot6=12$ 。

所以正确答案是 E。

There are $2! = 2$ ways to place the two boys at the two ends. There are $3! = 6$ ways to arrange the three girls in the middle seats.

Thus the total number of arrangements is $2\cdot6=12$ .

Thus, E is the correct answer.

2015 AMC 8 第 4 题

答案：E

难度评级：770

视频讲解：

文字解答：

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