Question

A homeowner chooses 9 of 25 plants at a nursery to landscape her front yard. Which expression gives the number of ways she can choose the plants?



9P25


25C9


9C25


25P9

Answer 1

You have originally 25! choices.

Then you can pick 9! so it's

25-9 = 16

So total choices you can make is:

(25!)/(9!*16!) = 2042975

Which option gives that result?

Answer 2

for selecting i think it should be 25C9 becuase for selection we use nCr

Answer 3

25C9 is the correct answer

Answer 4

ok thank you two