- #1

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## Homework Statement

[tex]\Sigma[/tex](-1)[tex]^{n+1}[/tex][tex]\frac{1}{n!}[/tex]

How many terms will suffice to get an approximation within 0.0005 of the actual sum? Find that approximation.

## Homework Equations

No idea.

## The Attempt at a Solution

What I tried doing is setting my absolute value of the series less than 0.005, but I have no idea how to get rid of that factorial.