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1. The problem statement, all variables and given/known data

1+2x+(4x^(2)/2!)+(8x^(3)/3!)+(16x^(4)/4!)+(32x^(5)/5!)+...

2. Relevant equations

I would use the ratio test. Which is....

lim as n→∞ (An+1/An)

3. The attempt at a solution

I know what to do to find the answer, but I don't know how to find the expression for the provided series.

I'm guessing it's ((2x^(n))/n!), then work with the ratio test from there?

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# Homework Help: Finding the radius of convergence

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