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7 people meet and shake hands with one another, how many
handshakes occur?
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Answer Posted / sahas
7 people ... U need two people for one handshake.
Using nCr Combination formula = n! / { (n-r)!r! }
i.e, 7C2 = 7! / {(7-2)! 2!}
= 7*6*5*4*3*2*1 / {(5*4*3*2*1)*(2*1)}
= 7*6 /{(2*1)}
=21
| Is This Answer Correct ? | 16 Yes | 1 No |
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