Small fix
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@ -600,7 +600,7 @@ For example,
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This formula can be derived as follows. Let
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\[ S = a + ak + ak^2 + \cdots + b .\]
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By multiplying both sides by $x$, we get
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By multiplying both sides by $k$, we get
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\[ kS = ak + ak^2 + ak^3 + \cdots + bk,\]
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and solving the equation
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\[ kS-S = bk-a\]
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