Latest TCS Aptitude Question SOLUTION: 20 men handshake with each other without repetition. What is the total number of handshakes made?

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20 men handshake with each other without repetition. What is the total number of handshakes made?

Asked In TCS karthikpriya (12 years ago)

Solved poojitha Read Solution (3)

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Read Solution (3) :

poojitha  (12 years ago)

to give a shake hand we need two persons ...hence 1 person can give shake hand to remaining 19 persons..
similarly 2nd one can give 18 as repitition is not allowed...
and 3rd,4th....20th persons gives....17,16,,,1
i.e., total shake hands = 19+18+17+16+15+14+13+12+11+10+9+8+7+6+5+4+3+2+1=190

Is this solution Helpfull? Yes (27) | No (2)  

vishwajeet swain  (12 years ago)

n(n-1)/2

thus 20*19/2
=190

Is this solution Helpfull? Yes (13) | No (11)  

Sushil  (12 years ago)

20C2 we get 20!/(2!*18!)=190

Is this solution Helpfull? Yes (12) | No (4)  

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