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OpenStudy (anonymous):
BRAIN TEASER: At a party, everyone shook hands with everybody else. There were 66 handshakes. How many people were at the party?
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OpenStudy (anonymous):
If you know permutations and combinations you can do this in one step, do you know it?
OpenStudy (anonymous):
Yep.
OpenStudy (anonymous):
what do you think it is?
OpenStudy (anonymous):
Then, it will be nC2=66, since a handshake consists of any two persons shaking hands with each other.
OpenStudy (anonymous):
If you simplify that, it would come as a quadratic equation as follows :|dw:1391936246972:dw|
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