Need some help on a easy question that i can't remenber how to do it

$\displaystyle \frac{1}{7^{3^{n+1}}} + \frac{1}{7^{3^{n+2}}} + ...$

$\displaystyle \frac{1}{7^{3^{n+1}}} (1+ \frac{1}{7^{x}} + ...)$

What should $\displaystyle x$ be?

Thank you

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- May 13th 2008, 07:48 PMkleenexCommon factor help
Need some help on a easy question that i can't remenber how to do it

$\displaystyle \frac{1}{7^{3^{n+1}}} + \frac{1}{7^{3^{n+2}}} + ...$

$\displaystyle \frac{1}{7^{3^{n+1}}} (1+ \frac{1}{7^{x}} + ...)$

What should $\displaystyle x$ be?

Thank you - May 13th 2008, 07:53 PMThePerfectHacker