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If there are 12 persons in a party, and if each two of them shake hands with each other, how many handshakes happen in the party?

did you learn combinations?
12c2=12! / 10! - 2! =66


66 times people will handshake in the party.
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plzzzzz mark,as the best
and the formula?
66 if one shakes hand to all the rest than he/she will be left next time.
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