After a get-together every person present shakes the hand of every other person. If there were 105 hands-shakes in all, how many persons were present in the party?
A. 15 B. 14 C. 13 D. 16

• ans is 15
  15c2= 105
• 12 years agoHelpfull: Yes(18) No(5)
• The answer is 14
  {n(n+1)}/2=105
  solving we get n=14
• 13 years agoHelpfull: Yes(6) No(16)
• everybody shake their hand to another two person
  so
  nC2 = 105
  by solving n = 15
  
  so ans is 15person..........
• 9 years agoHelpfull: Yes(1) No(2)
• A
  
  nC2 = 105
  So, n=15
• 9 years agoHelpfull: Yes(0) No(1)