$n^{\text{th}}$ term of the series $1 + \frac{3}{7} + \frac{5}{7^{2}} + \frac{1}{7^{2}} + \ldots$ is:

Question

$\frac{2n-1}{7^{n}}$

$\frac{2n+1}{7^{n}}$

$\frac{2n-1}{7^{n-1}}$

$\frac{2n+1}{7^{n}}$

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