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Post by ken on Jul 14, 2010 14:57:40 GMT -5
If seven people meet each other and each shakes hands only once with each of the others, how many handshakes will there have been?
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Post by Chilehead on Jul 22, 2010 21:23:51 GMT -5
21?
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Post by ken on Jul 25, 2010 17:35:05 GMT -5
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