Small fix
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@ -594,7 +594,7 @@ using the formula
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\[a + ak + ak^2 + \cdots + b = \frac{bk-a}{k-1}\]
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where $a$ is the first number,
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$b$ is the last number and the
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ratio between consecutive numbers is $x$.
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ratio between consecutive numbers is $k$.
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For example,
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\[3+6+12+24=\frac{24 \cdot 2 - 3}{2-1} = 45.\]
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