I have a problem where the question is, Prove $\displaystyle \frac{1}{2}P(2,1)+\frac{2}{3}P(3,2)+\frac{3}{4}(4, 3)+...+\frac{n}{n+1}P(n+1,n)=(n+1)!-1$ How do I start this? Do I use mathematical induction?
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Is $\displaystyle \displaystyle P(n,k)=\frac{n!}{(n-k)!}$? Then yes, the statement can be easily proved by induction.
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