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What is the remainder when the number below is divided by 11?

1 × 10^1 + 2 × 10^2 + 3 × 10^3 + . . . + 2015 × 10^2015

 Jun 16, 2022
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sumfor(n, 1, 2015, 10^n) mod 11==4- the remainder.

 Jun 16, 2022
edited by Guest  Jun 16, 2022

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