JAMB - Mathematics (2013 - No. 29)

In how many ways can 3 seats be occupied if 5 people are willing to sit?
60
20
5
120

Explanation

5 people can take 3 places in;

5P3 ways, = \(\frac{5!}{(5 - 3)!}\) = \(\frac{5!}{2!}\)

= \(\frac{5 \times 4 \times 3 \times 2!}{2!}\)

= 5 x 4 x 3

= 60 ways

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