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(a) 528 = 24 * 3 * 11

756 = 22 *3³ * 7 

Given 528x is a multiple of 756

528 *   32 * 7= 2 * 11  *( 22 *3³ * 7 ) = 756 *2 * 11

So smallest x is  32 * 7= 63

(b) 756 = 22 *3³ * 7 

528 = 24 * 3 * 11 = 22 * 11 * (22 * 3 )

So the smallest y = 22 * 11 = 44

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