[AtCoder] Let {\rm comb}(n,r) be the number of ways to choose r objects from among n objects, disregarding order. - 题解

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题目信息
题号 P16800
标题 [AtCoder] Let {\rm comb}(n,r) be the number of ways to choose r objects from among n objects, disregarding order.
难度 普及
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