(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

prove the following natural numbers n and r.

P(n-1,2) + 3P(n+1,2) = 2(2n^2 + 1) and P(n,r) = P(n-3,r-3)

3. The attempt at a solution

i honestly dont even know what this question is asking. this is a sort of handout of 3 questions our teacher gave us in which we havent ever done any questions like this, its to challenge us, but we also get marked on it, but im drawing blanks.

can i get any sort of start off help? or atleast an explanation on what im trying to achieve

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# Homework Help: Permutations help

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