中学数学题求教

2023-3-12 19:07| 发布者: gcyw123 | 查看: 1326| 原文链接

A wallet includes coins of 10 cents, 50 cents, $1 and $2. If there are 20 coins in total, and there is an equal chance of drawing every coin, what is the possibility of drawing two coins of the same value without replacement?

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