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**Sequences HELP!!!**

**1. Homework Statement**

Show that the sequence Cn = [(-1)^n * 1/n!]

**2. Homework Equations**

**3. The Attempt at a Solution**

This is an example in my book but I am not understanding it....

It says to find 2 convergent sequences that can be related to the given sequence. 2 possibilities are An = -1/2^n and Bn = 1/2^n

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where are they getting this from??