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Find the number of positive integers that satisfy the following conditions:
* Each digit is a 1 or a 2 or a 3
* The sum of the digits is 10

 Oct 31, 2022
 #1
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There are 133 numbers that work.

 Oct 31, 2022
 #2
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But what is your ceiling? Up to 1000, or up to 1,000,000, or up to 10^100 ??!

 Oct 31, 2022

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