There are twenty socks in a room .Ten of them are red ,ten of them are green.You are in the room
You want to get a pair of sock ,but it i dark ,you can't see the colours,How many socks must you take to be sure of getting a pair of socks the same color?
要拿几只袜子?
人气：416 ℃ 时间：2019-12-13 17:22:04
解答
左右脚一样就是3只
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