Mathematics, 05.06.2020 00:05 khalilwhite75

There are ten 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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There are ten kids in a class. When any two meet, each says “hi” to the other and the answer “hi” fo...

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