In how many ways can six persons be paired?
...In how many ways can six persons be paired?
5
10
15
20
Correct answer is C
6C\(_2 = \frac{6!}{[6-2]![2!]}\)
\(\frac{6*5*4!}{4!*2!}\)
= \(\frac{6*5}{2}\)
= 15
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