At the end of a banquet 10 people shake hands with each other. How many handshakes will there be in total?

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问题 At the end of a banquet 10 people shake hands with each other. How many handshakes will there be in total?

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答案45

解析试想这十个人排成一排，那么站在最左边的人依次与右边九个握手，而左边数第二个至于其右边八个人握手即可，依次类推，得出算式：9+8+7+…+2+1=45。

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B类竞赛（英语专业本科专科）

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