Question

In how many ways can 4 people be chosen and arranged in a straight line if there are 13 people from whom to choose?

Answer 1

17160

Explanation:

Total number = n = 13

Number required = r= 4

If the number required does not have a specific order then combinations is chosen.

If a specific arrangement is required then permutations is used.

Here a specific arrangement is mentioned therefore

13P4= 17160