Question

You own 6 hats and are taking 4 on vacation. In how many ways can you choose 4 hats from the 6?

Answer 1

nPr

Answer 2

I'd say nCr

Answer 3

can you explain how to do this concept i'm still confused by it!

Answer 4

You need to choose 4 out of 6, in a case in which order does not matter.

Answer 5

the available answers are
a) 360
b) 720
c) 1
D) 15

Answer 6

For this, you need a combination, not a permutation.
nCr = n!/((n-r)!r!)
In your case, this is
6C4 = 6!/(6 - 4)!4!) =
= (6 * 5 * 4!)/(2! * 4!) =
= 6 * 5 / 2
= 15

Answer 7

ok! thank you so much! thats makes more sense!!

Answer 8

wlcm