In a party every person shakes hands with every other person. If there were a total of 120 handshakes in the party then what is the number of persons present in the party ? Choose the correct choice from the following choices:
A) 15  B) 16  C) 17  D) 18  E) 19
Explanation :   Let the number of persons be n   ∴ total handshakes = nC2 = 120   n(n-1)/2 = 120 ∴ n = 16   Answer : Option 16
<result>B</result>
In a party every person shakes hands with every other person. If there were a total of 120 handshakes in the party then what is the number of persons present in the party ?