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 | ||||
| The final digit, $n_{10}$, is calculated as follows: | ||||
|  | ||||
| $$ | ||||
| 	\Biggr( \sum_{i = 1}^{9} i \times n_i \Biggl) \text{ mod } 11 | ||||
| 	\Biggr( \sum_{i = 1}^{9} (11 - i) \times n_i \Biggl) \text{ mod } 11 | ||||
| $$ | ||||
|  | ||||
| If $n_{10}$ is equal to 10, it is written as \texttt{X}. | ||||
|  | ||||
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