If the HCF of the polynomials \( f(x)=(x+3)\left(3 x^{2}\right. \) \( -7 x-a) \) and \( g(x)=(x-...

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If the HCF of the polynomials \( f(x)=(x+3)\left(3 x^{2}\right. \)
\( -7 x-a) \) and \( g(x)=(x-3)\left(2 x^{2}+3 x+b\right) \) is \( (x \)
\( +3)(x-3) \), then \( a+b= \)
(a) 3
(b) \( -15 \)
(c) \( -3 \)
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