In a party every person shakes hands with every other person. If there were a total of 190 handshakes in the party then what is the number of persons present in the party ? Choose the correct choice:
A) 15 B) 16 C) 17 D) 18 E) 20

Rationale: "explanation : let the number of persons be n â ˆ ´ total handshakes = nc 2 = 190 n ( n - 1 ) / 2 = 190 â ˆ ´ n = 20 answer : option e"
Answer: E