Question

find the number of ways of drawing participant shakes hands with every others participant . if the number of handshakes is 66 , find the number of participants in the meting​

Answer 1

Step-by-step explanation:

[n*(n-1)]/2=66

n^2 - n = 132

if you think then square of 12 is 144 and if 12 is deducted from 144 then answer is 132. so number of people are 12