SOLUTION: What is the combination of C (20,3)?

Algebra ->  Permutations -> SOLUTION: What is the combination of C (20,3)?      Log On


   

Question 525591: What is the combination of C (20,3)?
Answer by Maths68(1474) About Me  (Show Source):
You can put this solution on YOUR website!
=C(20,3)
=20!/3!(20-3)!
=20!/3!17!
=(20*19*18*17!)/(3*2*1*17!)
Cancel out 17!
=(20*19*18)/6
=20*19*3
=1140