In a train yard, there are 6 flat cars, 7 boxcars, and 3 livestock cars. a train is made up of 9 cars. which would you use to find the number of ways the train could be made up?

a. 16p9

b. 16p7

c. 9p16

d. 9p7

Option A

Step-by-step explanation:

In a train yard there are 6 flat cars, 7 box-cars and 3 livestock cars.

So total number of cars = 6 + 7 + 3

                                       = 16

Now a train is to be made by 9 cars, out of 16 cars.

So number of ways the train can be made up will be =

where n = 16 and r = 9

so number of ways =

Option A is the answer.

which expression represents the approximate length of bc?

step-by-step explanation: