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一、“互相握手”型计数方法例1某同学举行生日宴会,一共有20位同学参加,假设每两个同学互相握一次手,问:(1)每个同学握多少次手?(2)总共握手次数有多少?
First, “handshake ” type counting method Example 1 a classmate birthday party, a total of 20 students participated in, assuming that every two students hold each other hands and asked: (1) how many times each classmate hands? 2) What is the total number of handshakes?