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# The difference between two roots of the equation $x^3-13x^2+15x+189=0$ is 2. Then the roots of the equation are :

$\begin {array} {1 1} (a)\;-3,5,7 & \quad (b)\;-3,-7,-9 \\ (c)\;3,-5,7 & \quad (d)\;-3,-7,9 \end {array}$

(a) -3,5,7