BA LLB Banaras Hindu University 2019 Solved Paper

Question : 116 of 170

Marks: +1, -0

At a farewell function of 60 students, each student shakes hand with every second student. How many hand shakes will there be?

Solution:

Total number of handshakes

={ }^{60} {C}_{2}

=\;{60 !}/{2 !(60-2) !}=\;{60 × 59}/{2}

=30 × 59=1770

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