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How many different decimal strings of length 2 (strings of length two where each element of...

How many different decimal strings of length 2 (strings of length two where each element of the string is one of the decimal digits 0-9) are there where no digit can be repeated? How many length 3 decimal strings are there like this. How many length 7 decimal strings are there like this? How many length 11 decimal strings are there like this? Give an example of one of the length 11 strings.

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