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How many positive integers less than 5,000 have at most two different digits.

 Feb 4, 2019
 #1
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Give an example of what you mean by "at most two different digits".

 Feb 4, 2019
 #2
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read this: https://artofproblemsolving.com/wiki/index.php?title=2004_AIME_II_Problems/Problem_4

 Feb 4, 2019

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