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\( 1 \leftarrow \quad \) There are 60 runners in a race. How many ways can the runners finish first, second, and third?

Ask by Mejia Tucker. in the United States
Feb 26,2025

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There are 205,320 ways for the runners to finish first, second, and third.

Solución

Since the order of finishing matters (first, second, and third are distinct positions), we use permutations. This means we multiply the number of choices for first place by the number of choices for second place (after first has been chosen) and then the number of choices for third place. So, there are 60 possibilities for first place, 59 possibilities for second place, and 58 possibilities for third place. Multiplying these together gives: 60 × 59 × 58 = 205320 Therefore, there are 205,320 ways for the runners to finish first, second, and third.

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To determine the number of ways the runners can finish first, second, and third, we can think of this as a permutation problem where we want to arrange 3 out of 60 runners. The number of ways to choose 3 runners from 60, and arrange them in order, is given by the formula for permutations: \[ P(n, r) = \frac{n!}{(n - r)!} \] In this case, \(n = 60\) (the total number of runners) and \(r = 3\) (the positions we care about: first, second, and third). So, we calculate: \[ P(60, 3) = \frac{60!}{(60 - 3)!} = \frac{60!}{57!} = 60 \times 59 \times 58 \] Now let's perform the multiplication: \[ 60 \times 59 = 3540 \] \[ 3540 \times 58 = 205320 \] Thus, the number of ways the runners can finish in the top three positions is \(205320\).

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