21. If two positive integers a and b are written as a= x3y2 and b = xy3 , where x , y are p

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21. If two positive integers a and b are written as a= x3y2 and b = xy3 , where x , y are prime numbers, then HCF (a, b) is (a) xy (b) xy2 (c) x3 y3 (d) x2 y2

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