There is 7 friends (A1, A2, A3....A7).If A1 have to have shake with all without repeat. How many handshakes possible?
a) 6 b) 21 c) 28 d) 7

• a1 with (a2, a3,a4,a5,a6,a7)
  
  6 handshakes
• 13 years agoHelpfull: Yes(35) No(9)
• 21
  6+5+4+3+2+1=21
• 13 years agoHelpfull: Yes(12) No(54)
• simple a1 handshakes with a1,a2,a3,a4,a5,a6
  so the answer is total handshakes=6.
• 11 years agoHelpfull: Yes(2) No(3)
• as handshake of a1 is asked....they handshake with (a2,a3.....a7) . so their is ( n-1) handshake so answer is 6.
• 3 years agoHelpfull: Yes(0) No(0)