1^2+2^2+3^2+4^2...….....20^2=?
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∑ n² = [(n)(n+1)(2n+1)]/6
here n = 20
Ans = [20 x 21 x 41]/6 = 2870
here n = 20
Ans = [20 x 21 x 41]/6 = 2870
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here is the answer to the question
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