Fixed an error
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@ -8,7 +8,7 @@ Say we have a sequence of nine digits, forming a partial ISBN-10: $n_1 n_2 ... n
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The final digit, $n_{10}$, is calculated as follows:
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$$
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\Biggr( \sum_{i = 1}^{9} i \times n_i \Biggl) \text{ mod } 11
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\Biggr( \sum_{i = 1}^{9} (11 - i) \times n_i \Biggl) \text{ mod } 11
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$$
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If $n_{10}$ is equal to 10, it is written as \texttt{X}.
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