For the given values of n and r, evaluate (a) (a) When n = 20 and...

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For the given values of n and r, evaluate (a) (a) When n = 20 and r = 3, (Simplify your answer.) n! (n-r)! =. n! (n-r)! and (b) n! r!(n r)! for n = 20 and r = 3. For the given values of n and r, evaluate (a) (a) When n = 20 and r = 3, (Simplify your answer.) n! (n-r)! =. n! (n-r)! and (b) n! r!(n r)! for n = 20 and r = 3.

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