Question

Ms. Lunette has 18 students in her class. She wants to send 3 of these students to pick up books for the class. How many combinations of 3 students can she choose?
A. 6
B. 54
C. 816
D. 4896

Answer 1

I know for sure that the answer is not either A or D

Answer 2

I think most likely C

Answer 3

tbh I'm not sure

Answer 4

The number of ways of selecting 'r' number of different things from 'n' number of different things is nCr.
So, here, Ms. Lunette has to select 3 different students from 18 different students. The Number of ways of doing so is
18C3 = 18!/3!(18-3)! = 18!/3!15! = (16 * 17 * 18) / (1 * 2 * 3) = 816. The answer is c.

Answer 5

can she repeat people?

Answer 6

18C3 = 816

Answer 7

Yes
She can

Answer 8

then follow qwerty's concept

Answer 9

ok
Thx 2 all who came to help thou

Answer 10

;)