Everyone shakes hands with everyone else in a room. Total number of handshakes is 91. Number of persons=?	Choose one.
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 = 91 OR n(n-1)=182 OR n=14   14nswer is (14)
<result>A</result>
Everyone shakes hands with everyone else in a room. Total number of handshakes is 91. Number of persons=?