Question

Indicate the formula for the following conditions.

C(n,r) =

I got C(n, r) = ( n r. ) = n! r!(n−r)! so far but I'm not sure what to do after this

Answer 1

nCr = n! / (r!(n-r)!),

Explanation:

The formula for C(n,r), also known as "n choose r" or a combination,

is:

nCr = n! / (r!(n-r)!),

where n is the total number of options and r is number you must choose

The number generated is the total number of possible combinations.

The ! means factorial. For example, 4! = 4 x 3 x 2 x 1