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Mathematics, 22.05.2021 22:00 hjeffrey168
there are 10 kids in a class. When they meet eachs says hi to the other and the answer "hi" follows. Before the class starts, how many times woul one hear the word "hi"?
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there are 10 kids in a class. When they meet eachs says hi to the other and the answer "hi" follows....
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