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  3. There are 10 people in a room. If each person shakes hand with exactly 4 other people, what is the total number of handshakes?

There are 10 people in a room. If each person shakes hand with exactly 4 other people, what is the total number of handshakes?

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问题 There are 10 people in a room. If each person shakes hand with exactly 4 other people, what is the total number of handshakes?
选项 A、20
B、30
C、40
D、50
E、60
答案A
解析 10个人，每人握手4次，那总数是40次。但每次握手是两个人，相当于每次握手的行为算了2次，所以40/2=20，答案是A。
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