Answer:
Step-by-step explanation:
This is what I got
Answer:
There are 3,628,800 different ways for the runners to finish.
Step-by-step explanation:
Arrangments of x elements:
The number of possible arrangments of x elements is given by the following formula:

In this question:
10 different runners, which means that the number of different ways that there are for the runners to finish is an arrangment of 10 elements. So

There are 3,628,800 different ways for the runners to finish.
20: 1,2,4,5,10,20
28: 1,2,4,7,14,28
The answer is 42 mpg, all you need to do is divide 126/3 or 210/5 and they both equal 42.