Question

What is 8C5?

Answer 1

8!/(5!*(8-5)!)

Answer 2

nCk = n!/((n-c)!c!)

Answer 3

.......@dan815

Answer 4

Ill try that tho thx any ways

Answer 5

yes, do you want to know where the formla is coming from?

Answer 6

YESSS PLZZ

Answer 7

okay well 8 C 5 means 8 choose 5, we just want to choose 5, we dont care bout the order or anything, just if the 5 we are picking are different all the time

Answer 8

Ok....

Answer 9

if you remember from permutations
to pick 5 from 8
that would be
8*7*6*5*4
however in this case the order matters to discount the order we think about how many different orders are there for 5 spots
that is 5! so
8 Choose 5 = (8*7*6*5*4)/5! = 8!/(3!*5!)

Answer 10

dividing by 5! works because for any case
in the permutations way like say
A B C D E and E D C B A <---- this is the same in choose its the same 5 letters, there are 5! ways to arrange the same 5 letters so we just want 1 instance there are 5! times more cases than we need for each combination.. so we divide by 5!

Answer 11

I hope that makes sense

Answer 12

another way to think about it is
8 C 5 = (8 P 5 / 5!)

Answer 13

Yes that does...Thank you soo much

Answer 14

okay no problem!