SOLUTION: If there are 12 persons in a party and each of them shake hands with all others.What is the total number of shake ?

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Question 1019559: If there are 12 persons in a party and each of them shake hands with all others.What is the total number of shake ?
Answer by ikleyn(52777) About Me  (Show Source):
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If there are 12 persons in a party and each of them shakes hands with all others. What is the total number of shakes ?
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%2812%2A11%29%2F2 = 6*11 = 66.