At the end of a business conference the ten people present all shake hands with each other once. How many handshakes will there be altogether ?

A. 20 B. 45
C. 55 D. 90

• 45
  
  number of handshakes = 10C2= 10*9/2 = 45
• 12 years agoHelpfull: Yes(9) No(0)
• clearly total no.of hand shakes=(9+8+7+6+5+4+3+2+1)=45
• 12 years agoHelpfull: Yes(7) No(2)
• (n(n+1)/2 )-10=(10*11/2)-10=45
  
• 9 years agoHelpfull: Yes(1) No(0)
• sardaar ji ka jalwaaaa....
• 8 years agoHelpfull: Yes(0) No(1)