SOLUTION: 20!/3!(20-3)!

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Question 505703: 20!/3!(20-3)!
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
(20!)/(3!*(20-3)!)

(20!)/(3!*17!)

(20*19*18*17!)/(3!*17!)

(20*19*18)/(3!)

(20*19*18)/(3*2*1)

(6840)/(6)

1140


So (20!)/(3!*(20-3)!) = 1140