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How many (positive) seven digit integers are there that have a digit sum equal to 10 and that are formed using only the digits 1, 2 and 3?

 Jul 3, 2020
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There are 1,582 numbers between 1,000,000 and 9,999,999 that sum up to 10 using the three digits of:1, 2, 3

 Jul 3, 2020

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