Summation of Grandi's Series - Proof Through 1 / X Series

Proof Through 1 / X Series

The series:

Is fairly easy to prove. First, multiply everything by x. On the left side, this makes 1, and on the right side we'll represent x as (x - 1) + 1. Multiply the series by (x - 1) and 1 separately and add the two together.

All terms except 1 cancel out, leaving:

Applying this series to 2 gives:

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