There are 10 people in a room. If each person shakes hand with exactly 4 other p

游客2024-01-12  25

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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