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The condition that the roots of the equa...

The condition that the roots of the equation `ax^3+bx^2+cx+d=0` may be in `A.P.`, if (i) `2b^3+27a^2d=9abc` (ii) `2b^3+27a^2d=-9abc` (iii) `2b^3-27a^2d=9abc` (iv) `2b^3-27a^2d=-9abc`

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