Question

There are 6 books on a reading list.
Students must read 3 of the books on the
list. In how many different ways can a
student select 3 books?

Answer 1

6 nCr 3

Answer 2

i dont get that

Answer 3

That means that you are choosing 6 out of 3.

Answer 4

so do i use the formula: n! / ( r!(n - r)! )

Answer 5

Yes!

Answer 6

may i ask. what does n and r mean?

Answer 7

Here is the calc for you.
http://www.calculatorsoup.com/calculators/discretemathematics/combinations.php

Answer 8

easy you just multiply the number of books total time the required to read 6x3=18
I think

Answer 9

n is number you are choosing from and r is the number you are choosing.

Answer 10

like in your case n=6 and r=3

Answer 11

18 is not on the option @Adriana101

Answer 12

thank you all!

Answer 13

18?! No no no, this is COMBINATIONS !

Answer 14

You welcome!