The sum of n terms of the series 5/1.2.1...

The sum of n terms of the series 5/1.2.1/3+7/2.3.1/3^2+9/3.4.1/3^3+11/4.5.1/3^4+..` is (A) `1+1/2^(n-1).1/3^n` (B) `1+1/(n+1).1/3^n` (C) `1-1/(n+1).1/3^n` (D) `1+1/2n-1.1/3^n`

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