(2^(n- 1)+7^n)/(2^(n+1)+7^(n+1))==1/(4+14/(2/7)^n)%<br />2B1/(2/(7/2)^n+7)(2^(n- 1)+7^n)/(2^(n+1)+7^(n+1))==1/(4+14/(2/7)^n)%<br />2B1/(2/(7/2)^n+7)

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