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Number Theory Level 3

1×101+2×102+3×103+⋯+2015×102015 1 \times 10^{1}+2 \times 10^{2}+3\times 10^{3}+\cdots+2015 \times 10^{2015}

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

Steven Mai by Steven Mai
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