Question

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

How many combinations of 4 students can he choose?

A.
5

B.
80

C.
4845

D.
116,280

Answer 1

@SolomonZelman

Answer 2

maby A.?

Answer 3

20 nPr 4

Answer 4

I don't have a calculator to count this, sorry.

Answer 5

well......idk i still thinks its a

Answer 6

wait dont u have a comp calculator

Answer 7

...

Answer 8

@SolomonZelman ?

Answer 9

@SolomonZelman

Answer 10

@e.mccormick

Answer 11

@SolomonZelman

Incorrect. You gave a permutation, we want a combination.

Answer 12

20 nCr 4, my bad!

Answer 13

We want a combination of 4 from 20; 20 C 4.

You can use the calculator for this if your teacher allows the use of a calculator to compute combinations.

Answer 14

C?

Answer 15

d

Answer 16

is the formula 20p4 if it is the asnwere is d wolfram is the source https://www.wolframalpha.com/