20 men handshake with each other without repetition. What is the total number of handshakes made?
a) 190 b) 210 c) 150 d) 250

• 20 men can make handshakes with each other without repitition= 20c2=190 ans.
  
• 12 years agoHelpfull: Yes(38) No(6)
• 1+2+3+...............19=190
  
  in this we cant get any repetition so ans is 190.
  
  
  thanks
• 12 years agoHelpfull: Yes(16) No(6)
• Total no. of handshake =20c2=190
• 8 years agoHelpfull: Yes(2) No(0)
• 19+18+17..........+1=190
• 8 years agoHelpfull: Yes(1) No(0)
• 20c2=90 so ans is 90
• 8 years agoHelpfull: Yes(0) No(2)
• for without repetition formula =n(n-1)/2
  n=number of persons
  20(20-1)/2=190
• 5 years agoHelpfull: Yes(0) No(0)
• N*( n-1) / 2!
  20*19 / 2 = 190
• 4 years agoHelpfull: Yes(0) No(0)