RSM wants to send four of its 18 Math Challenge teachers to a conference. How many combinations of four teachers include Mrs. Ve

Question

1 year ago

5

ra(only)?

1 answer:

Marina86 [1] · Answer 1 · 2023-05-16T12:57:43+03:00

There are 680 combinations of four teachers include Mrs. Vera(only)

<h3>How to determine the number of combination?</h3>

The given parameters are

Teachers, n = 18

Selected teachers. r = 4

The selection must include Mrs. Vera.

So, the remaining parameters are:

Teachers, n = 17

Selected teachers. r = 3

The combination is then calculated as:

Ways = nCr

This gives

Ways = 17C3

Apply the combination formula

Ways = 17!/(14!3!)

Evaluate the expression

Ways = 680

Hence, there are 680 combinations of four teachers include Mrs. Vera(only)