In how many ways can six persons be paired?
FURTHER MATHEMATICS
WAEC 2022
In how many ways can six persons be paired?
- A. 5
- B. 10
- C. 15
- D. 20
Correct Answer: C. 15
Explanation
6C\(_2 = \frac{6!}{[6-2]![2!]}\)
\(\frac{6*5*4!}{4!*2!}\)
= \(\frac{6*5}{2}\)
= 15
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