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Numerical Ability
Permutation and Combination
20 men handshake with each other without repetition. What is the total number of handshakes made?
a) 190 b) 210 c) 150 d) 250
Read Solution (Total 7)
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- 20 men can make handshakes with each other without repitition= 20c2=190 ans.
- 13 years agoHelpfull: Yes(38) No(6)
- 1+2+3+...............19=190
in this we cant get any repetition so ans is 190.
thanks - 13 years agoHelpfull: Yes(16) No(6)
- Total no. of handshake =20c2=190
- 9 years agoHelpfull: Yes(2) No(0)
- 19+18+17..........+1=190
- 9 years agoHelpfull: Yes(1) No(0)
- 20c2=90 so ans is 90
- 9 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 - 5 years agoHelpfull: Yes(0) No(0)
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