<commit_before>---
title: Sums of geometric series
---

\\[
  \\sum_{i=0}{\\infty} \\binom{i+j}{j} x^i = \\frac{1}{{(1-x)}^{j+1}}.
\\]

That's cool.<commit_msg>fix sums of geometric series<commit_after>---
title: Sums of geometric series
---

\\[
  \\sum_{i=0}^{\\infty} \\binom{i+j}{j} x^i = \\frac{1}{ {(1-x)}^{j+1} }.
\\]

That's cool.
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