SOLUTION: 21^2+22^2+23^2+24^2+25^2+26^2+27^2+28^2+29^2+30^2
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Algebra: Sequences of numbers, series and how to sum them
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Question 683591
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21^2+22^2+23^2+24^2+25^2+26^2+27^2+28^2+29^2+30^2
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