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100 people come to a conference. Each of them exchanges a business card with each of the others. ?

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How many cards are exchanged?

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  1. if each person give out a card to everyone else, then each person gave out 99 cards (since they aren't going to give one to themselves).

    100 people giving out 99 cards each is 100 x 99


  2. I agree the answer will be 100 x 99....

    = 9900
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