For the given values of n and r, evaluate (a) n! (n-r)! and (b) - n! (a) When n = 13 and r = 6, -0. (n-r)! (Simplify your answer. Type an integer or a simplified fraction.) r!(n-r)! n! (b) When n = 13 and r = 6, r!(n-r)! (Simplify your answer. Type an integer or a simplified fraction.) n! for n 13 and r = 6. ...

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