Everyone shakes hands with everyone else in a room. Total number of handshakes is 105. Number of persons=?	Choose the correct choice from the following options:
A) 14 B) 12 C) 11 D) 15 E) 16
In a room of n people, the number of possible handshakes is C(n,2) or n(n-1)/2   So n(n-1)/2 = 105 OR n(n-1)=210 OR n=15   Answer is (15)
<result>D</result>
Everyone shakes hands with everyone else in a room. Total number of handshakes is 105. Number of persons=?