Mr. Jefferson has 20 students in his class. He wants to send 4 of these students to pick up books for the class.

Question

How many combinations of 4 students can he choose?

A)5
B)80
C)4845
D)116,280

Answer 1

20C4
where nCr=n!/((n-r)!r!)

Answer 2

The answer is B

Answer 3

Bakhrom Khalmatov is not savage