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  1. Write each of «math style=¨font-family:`Times New Roman`¨ xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mn»18«/mn»«mi»a«/mi»«msup»«mi»b«/mi»«mn»3«/mn»«/msup»«/math» and «math style=¨font-family:`Times New Roman`¨ xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mn»27«/mn»«msup»«mi»a«/mi»«mn»3«/mn»«/msup»«mi»b«/mi»«/math» as the product of their GCF and another monomial factor.

    Determine the GCF.