Hi guys, can anyone please tell me the combinatorial and algbraic proof of P(n+1, r) = P(n,r) + P(n,r-1)? Thanks for your help.
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No. What are you even talking about?
Originally Posted by cookiejar Hi guys, can anyone please tell me the combinatorial proof of P(n+1, r) = P(n,r) + P(n,r-1)? That is not true of permutations. Let while Is true for combinations .
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