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January 28, 2015

January 28, 2015

Posted by **Renee** on Sunday, November 7, 2010 at 10:06am.

- Math -
**Reiny**, Sunday, November 7, 2010 at 10:11amFor n people the number of handshakes would be

C(n,2)

so

n!/(2!(n-2)!) = 55 , where n is a positive integer.

n(n-1)/2 = 55

n(n-1) = 110

n^2 - n - 110 = 0

(n-11)(n+10) = 0

n = 11

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