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If the line y=3x meets the lines x=1,x=2...

If the line `y=3x` meets the lines `x=1,x=2……….,x=12` at points `A_(1),A_(2)…….A_(12)` respectively then `(OA_(1))^(2),+(OA_(1))^(2)+....+(OA_(12))^(2)` is equal to `"___________".`

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