If the HCF of the polynomials \( (x+4)\left(2 x^{2}+5 x+\right. \) a) and \( (x+3)\left(x^{2}+7 ...

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If the HCF of the polynomials \( (x+4)\left(2 x^{2}+5 x+\right. \)
a) and \( (x+3)\left(x^{2}+7 x+b\right) \) is \( \left(x^{2}+7 x+12\right) \) then \( 6 a+b \) is
(a) \( -6 \)
(b) 5
(c) 6
(d) \( -5 \)
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