SOLUTION: how many people will do 66 handshakes?

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Question 1028058: how many people will do 66 handshakes?
Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
Well, here you set
n%28n%2B1%29+%2F+2+=+66
and solve for n...
n(n+1) = 132
n = 11
which means there are 12 people...