Time remaining:
how many people are at the party

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at a party everyone shakes hands with each person at the party. altogether there are 45 handshakes. how many people are at the party

Oct 18th, 2017

n*(n-1)/2=45

n^2-n=90

n=10




Sep 15th, 2014

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Oct 18th, 2017
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Oct 18th, 2017
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