The HCF of the polynomials \( 70\left(x^{3}-1\right) \) and (V) \( 105\left(x^{2}-1\right) \) is...

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The HCF of the polynomials \( 70\left(x^{3}-1\right) \) and
(V) \( 105\left(x^{2}-1\right) \) is
(a) \( 15(x-1) \)
(b) \( 35(x-1) \)
(c) \( 35\left(x^{2}-1\right)\left(x^{2}+x+1\right) \)
(d) \( 15\left(x^{2}-1\right) \)
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