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sum of 1 2 2 2 3 2 n 2 formula
sum of 1 2 2 2 3 2 n 2 formula
sum of 1^2+2^2+3^2+...+n^2
2^0+2^1+...+2^n formula
1^2+2^2+3^2+...+n^2 formula
sum of 2/3 and 2/9