I've just started learneing about permutations and i've come across a problem that has completely stumped me. Prove P(n, 2) = P(n-1, 2) + 2P(n-1, 1) Thanks, Joe
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In general so we have: .
thanks A LOT! for getting me started i have figured it out! they both reduce to (n^2) - n
Originally Posted by DaCoo911 I've just started learneing about permutations and i've come across a problem that has completely stumped me. Prove P(n, 2) = P(n-1, 2) + 2P(n-1, 1) Thanks, Joe Make use of the fact that
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