Images P 1 2 3 N

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P 1 2 3 n. (2n-1)/2^n. (2n)!/(2n)!-(2n+1). (N+1)!/(N-1)!=12. 2^N+1 + 2^N-2.
(2n-1)/2^n. (2n)!/(2n)!-(2n+1). (N+1)!/(N-1)!=12. 2^N+1 + 2^N-2.

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