mathbrain78 mathbrain78

24-08-2018
Mathematics

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there are 9000 four digit numbers. 4536 of the four digit numbers have no repeating digits. How many four digit numbers have at least one repeating digit?

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benscheidhauerozarks benscheidhauerozarks

24-08-2018

This is subtraction:

9,000-4,536=4,464

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