If the roots of the equation ${x^3} - 12{x^2} + 39x - 28 = 0$ are in $A.P.$, then their common difference will be
If the roots of the equation ${x^3} - 12{x^2} + 39x - 28 = 0$ are in $A.P.$, then their common difference will be
- A
$ \pm 1$
- B
$ \pm 2$
- C
$ \pm 3$
- D
$ \pm 4$
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- [JEE MAIN 2021]
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