SOLUTION: Nine people exchanged presents with each other. How many presents were here?
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Question 1132538: Nine people exchanged presents with each other. How many presents were here?
Answer by MathLover1(20849) (Show Source): You can put this solution on YOUR website!
One person would give one present to the others (assuming each person brought presents, would not give one to themselves). If all do the same, then the answer would be .
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