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85问答库 > 数学排列组合：为什么有n个车站，客运车票就有An2种啊？

数学排列组合：为什么有n个车站，客运车票就有An2种啊？

2025-04-07 06:45:40

推荐回答（1个）

回答1：

你好！
一张票是从一个站到另一个站，所以可以看做从n个车站中选2个站有多少种选法就有多少种票。一共有Cn2种，又因为站之间是有顺序的，所以还需要乘以A22.
Cn2乘以A22就是An2了
希望对你有所帮助，望采纳。

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