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Prove that P(n,r) / n = P(n-1,r-1)
I know that it is right but I have having a hard time coming up with a step by step solution.
Is P(n-1,r-1) the same as (n-1)!
I know that it is right but I have having a hard time coming up with a step by step solution.
Is P(n-1,r-1) the same as (n-1)!