Mathematics
Mathematics, 19.07.2019 12:00, dest8860

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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There are nine kids in a class. when any two meet, each says "hi" to the other and the answer "hi" f...

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