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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