In a birthday party, every person shakes hand with every other person. If there was a total of 28 handshakes in the party, how many persons were present in the party?
Choose the correct choice from the following options:
A) 5
B) 8
C) 1
D) 9
E) 7
Suppose there are nn persons present in a party and every person shakes hand with every other person. Then, total number of handshakes   = nC2=n(n−1)/2   n(n−1)=28×2n(n−1)=56   n=8   Ans: 8
<result>B</result>
In a birthday party, every person shakes hand with every other person. If there was a total of 28 handshakes in the party, how many persons were present in the party?