SOLUTION: N politicians meet at party .thre are 66 way for hand shakes if each politicians shakes hand with every other politicians once only once .find how many politicians are in party

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Question 1129447: N politicians meet at party .thre are 66 way for hand shakes if each politicians shakes hand with every other politicians once only once .find how many politicians are in party
Answer by ikleyn(52855) About Me  (Show Source):
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%28n%2A%28n-1%29%29%2F2 = 66


n*(n-1) = 66*2 = 132


n = 12.      ANSWER