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From (8) people, in how many ways can a president, secretary and treasurer be chosen if no person holds more than one post?

Answer and explanation

Correct answer: (336)

The three offices are different, so assigning the same three people in different offices creates different outcomes. This is an ordered selection, not an ordinary combination. Choose the president in 8 ways, then the secretary from the remaining 7 people, and finally the treasurer from the remaining 6 people. The condition that nobody holds two offices is automatically respected by reducing the choices after each selection.

The total number is \(8\times7\times6=336\), equivalently \({}^{8}P_{3}=\frac{8!}{(8-3)!}\). Since president, secretary, and treasurer are distinct roles, order matters. Therefore option A, 336, is correct. The value 56 would be \(\binom{8}{3}\), which chooses people without assigning offices and is therefore insufficient.

Related tags

PermutationsPostsOrdered Selection

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