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P 1 2 3 n. An=(3n-2)/(2n-1). 2n(2n+2)−(2n−2)(2+2n).. N(N-1)/2. N2+2n-2.
An=(3n-2)/(2n-1). 2n(2n+2)−(2n−2)(2+2n).. N(N-1)/2. N2+2n-2.

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