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Three distinct points A(x1, y1), B(x2, y...

Three distinct points `A(x_1, y_1), B(x_2, y_2), C(x_3, y_3)` lie on the parabola `y = 3x^2.` If `x_1, x_2, x_3` are in A.P. and `y_1, y_2 and y_3` are in G.P. then the common ratio of the GP is

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