There are nine kids in a class. When any two meet, each says "hi" to the other and the answer "hi" follows. Before the class starts, how many times would one hear the word "hi"?

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asked Apr 5, 2019 98.4k views

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There are nine kids in a class. When any two meet, each says "hi" to the other and the answer "hi" follows. Before the class starts, how many times would one hear the word "hi"?

Mathematics
middle-school

Fran B asked

by Fran B

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72 times, I believe. Hope I helped.

Ariel Malka answered Apr 9, 2019

by Ariel Malka

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