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The quadratic equation whose sum and product of roots are 'a' and $\frac{1}{a}$, respectively is :
- (a)$ax^2 - ax + 1 = 0$
- (b)$ax^2-a^2x + 1 = 0$
- (c)$ax^2 + ax + 1 = 0$
- (d)$ax^2 + a^2x - 1 = 0$
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(B) $ax^2 - a^2x + 1 = 0$