A number theory problem by Anubhav Jain

Number Theory Level pending

At a party, everyone shook hands with everybody else. There were 66 handshakes. How many people were at the party?


The answer is 12.

Anubhav Jain by Anubhav Jain , 40, India

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1 solution

Brock Brown
Dec 26, 2014 
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def handshakes(p):
    return (p * (p - 1)) / float(2)
people = 2
test = handshakes(people)
while test != 66:
    people += 1
    test = handshakes(people)
print "Number of people:", people

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