Question

I don't get this statement

Answer 1

C means choosing

Answer 2

yes

Answer 3

it got simplified it started as a 2 variables and simplied

Answer 4

and simplfied as a fn of 2 vars

Answer 5

n+5 Choose r-2/5 =n+5 choose r-1/10
(n+5)!/((r-2)!(n+5-r-2)!)=(n+5)!/((r-2)!(n+5-r-2)!)=(n+5)!/((r-1)!(n+5-r-1)!)=

Answer 6

(r-2)!=r-2)(r-1)!

Answer 7

n+5-r-2 ! = (n-r+3)!
n+5-r-1 ! = (n-r+4)!= n-r+4(n-r+3)!

Answer 8

start cancelling from left and right side

Answer 9

ignore the fact that im not playing any of my brackets properly in those statements im assume u know how the brackets shud go there

Answer 10

placing