There are 7 friends (A1, A2,......,A7).If A1 have to shake hand with all without repeat.
How many handshakes possible?
a) 6 b) 21 c) 28 d) 7

• answer: 6
  coz a1 can shakehands wid other 6 persons
• 12 years agoHelpfull: Yes(8) No(1)
• total hand shakes of all the people will be 21
  by (7*(7-1))/2
  
• 12 years agoHelpfull: Yes(2) No(7)
• Answer: 6!
  A1 can shake hands with 6 people, A2-A7
  
  A2 can shake hands with 5 people, A3-A7
  and so on
  If there are n people, there are (n-1)! ways for them to shake hands.
  In this case, 6!=720 ways.
• 12 years agoHelpfull: Yes(0) No(5)
• @admin plz explain this que it is ambiguous in meaning, whether we need to find for a1 or total handshakes
• 11 years agoHelpfull: Yes(0) No(0)
• answer is :21
  
  a1 give to 6 members
  a2 gives to 5 mem
  a3 gives to 4 mems
  a4 gives to 3 mems
  a5 gives to 2 mems
  a6 gives to 1 mem
  a7 gives to 0 mem bcz he has already taken from all mems so total is :6+5+4+3+2+1+0=21
• 11 years agoHelpfull: Yes(0) No(0)