2021 April MIMC 10 Problems/Problem 15
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Paul wrote all positive integers that's less than 
and wrote their base 
representation. He randomly choose a number out the list. Paul insist that he want to choose a number that had only 
and 
as its digits, otherwise he will be depressed and relinquishes to do homework. How many numbers can he choose so that he can finish his homework?
Solution
To be Released on April 26th.
