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If the sum and the product of the roots of the quadratic equation $ax^2 + 6x + 4a = 0$ are equal, then 'a' is equal to :
- (a)$\frac{3}{2}$
- (b)$-\frac{3}{2}$
- (c)$\frac{2}{3}$
- (d)$-\frac{2}{3}$
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Sol. (B) $-\frac{3}{2}$