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Mark the correct alternative in each of the following questions.
If two positive integers \( a \) and \( b \) are written as \( a=x^{3} y^{2} \) and \( b=x y^{3} ; x, y \) are prime
(IV numbers, then \( \operatorname{HCF}(a, b) \) is
(a) \( x y \)
(b) \( x y^{2} \)
(c) \( x^{3} y^{3} \)
(d) \( x^{2} y^{2} \)
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