Can a valid 13-digit ISBN have 'x as one of characters? [closed]

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can a valid 13-digit ISBN have any character other then digit 0-9? i.e., can a valid 13-digit ISBN contain character 'X'?

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No, a 10-digit ISBN can, though... See http://en.wikipedia.org/wiki/International_Standard_Book_Number#ISBN-13

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No, a 13-digit ISBN uses modulo 10 in calculation of the check digit, so the check digit can be only 0 to 9. Other digits are also 0 to 9 in any versions of ISBN. See this Wikipedia article for details.

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No it can't - the Wikipedia page explains:

The calculation of an ISBN-13 check digit begins with the first 12 digits of the thirteen-digit ISBN (thus excluding the check digit itself). Each digit, from left to right, is alternately multiplied by 1 or 3, then those products are summed modulo 10 to give a value ranging from 0 to 9. Subtracted from 10, that leaves a result from 1 to 10. A zero (0) replaces a ten (10), so, in all cases, a single check digit results.