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Small fix

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Antti H S Laaksonen 2017-05-17 21:26:10 +03:00
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chapter01.tex
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@ -600,7 +600,7 @@ For example,
This formula can be derived as follows. Let
\[ S = a + ak + ak^2 + \cdots + b .\]
By multiplying both sides by $x$, we get
By multiplying both sides by $k$, we get
\[ kS = ak + ak^2 + ak^3 + \cdots + bk,\]
and solving the equation
\[ kS-S = bk-a\]