pick any 11 members out of 18

Question

math

 

 

 

 

Answer 1

 

 

pick any 11 members out of 18

 

 

This is a combination.

 

Factorial examples:   5!=5*4*3*2*1

                              8!=8*7*6*5*4*3*2*1

 

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

C(18,11)=18!/(11!(18-11)!

            =18!/(11!7!)     used calculator            =  31824