How many 2 digit numbers have no digits that are repeated? (For example 11, 22, 33)

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There are 2-digit numbers from 10 to 99, which make 90 numbers. Out of these there are 9 with repeated digits, leaving 90-9=81 with no repeated digits. 

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if 1=11,2=22,3=33,4=44,5=55,9=99,than 11=?
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