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EVERYBODY IN A A ROOM SHAKES HANDS WITH EVERY BODY ELSE.THE TOTAL NUMBER OF HANDSHAKES IS 66.THE TOTAL NUMBER OF PERSONS IN THE ROOM IS? a)11 b)12 c)13 d)14

EVERYBODY IN A A ROOM SHAKES HANDS WITH EVERY BODY ELSE.THE TOTAL NUMBER OF HANDSHAKES IS 66.THE TOTAL NUMBER OF PERSONS IN THE ROOM IS?

a)11 b)12 c)13 d)14

Grade:12

1 Answers

bharat bajaj IIT Delhi
askIITians Faculty 122 Points
10 years ago
total no of handshakes = nC2 = 66
n (n-1) /2 = 66
ior n(n-1) = 66*2 = 11*12
No. of people = 12
Thanks
Bharat Bajaj
IIT Delhi
askiitians faculty

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