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How many numbers from 1 to 10000 have the property that the sum of the digits is equal to 3?

 Sep 9, 2020
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3  12  21  30  102  111  120  201  210  300  1002  1011  1020  1101  1110  1200  2001  2010  2100  3000  Total =  20 such numbers.

 Sep 9, 2020

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