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umzung

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- Homework Statement
- Calculate:

- Relevant Equations
- The sum of 5 x 10^i, from i=0 to i=n-1

I'm using the sum of a geometric series formula, but I'm not sure how to find the ratio, r. The

The solution is below, but I'm having trouble with the penultimate step.

*n*is confusing me.The solution is below, but I'm having trouble with the penultimate step.