Latest TCS Aptitude Question SOLUTION: can any one explain me how we calculate no of handshakes in a group

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can any one explain me how we calculate no of handshakes in a group

Asked In TCS manish agarwal (11 years ago)

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Arjun  (11 years ago)

simple yaar nC2...if 15 people in the party they shakes hand together to each other than 15C2=105 ans

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akshay kapoor  (11 years ago)

use formula
n(n-1)/2
n=no. of people it will give answer..

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Sachin Grover  (11 years ago)

answer = n(n-1)/2
Explain:- Suppose there are 6 people and the have to shake with every other person so to shake hand we need two hands. 1st hand is selected in 6 way and 2nd hand is selected in 5 ways. so 6*5 ways=30 ways but there is overcounting because hand shake of Sachin and rahul is same as shake hand of Rahul and Sachin so divide by 2!. therefore answer is n(n-1)/2 i.e. (6*5)/2=15 in this case.

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