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N1 n2. N1/n2 p1/p2. ∑_(N=1)^∞(N/(2n+1) )^(n ) 〗. 1/N(N+1)(N+2).   1  2 2 2 N N N.
N1/n2 p1/p2. ∑_(N=1)^∞(N/(2n+1) )^(n ) 〗. 1/N(N+1)(N+2).   1  2 2 2 N N N.

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