Question
Use the formula for the sum of a geometric series to find the sum or state that the series diverges.$$\sum_{n=1}^{\infty} e^{-n}$$
Step 1
A geometric series is a series where each term after the first is found by multiplying the previous term by a fixed, non-zero number called the ratio. In this case, the ratio is $e^{-1}$ or $\frac{1}{e}$. Show more…
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