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There are 2015 marbles in a container. The marbles are numbered from 1 to
2015. Marbles with equal digit sums have the same color and marbles with
different digit sums have different colors. How many different colors of marbles
are there in the container?​

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Step-by-step explanation:

I'm not certain but I believe it is 29

From 1 to 2015 the number with the highest digit sum is 1999. 1+9+9+9=28. Also digits can add up to all the numbers between 0 and 28 including 0 and 28, making 29 possible sums.

I don't fully understand the question but that is the best answer I can give from what I think they mean

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