Question : If the HCF of xy3, x2 y, and x3 y4 is xy, then their LCM is________.
Option 1: x3 y4
Option 2: x3 y3
Option 3: x4 y3
Option 4: x4 y4
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Correct Answer: x 3 y 4
Solution : In xy 3 , x 2 y, and x 3 y 4 The highest power of x = 3 The highest power of y = 4 ⇒ LCM = x 3 y 4 Hence, the correct answer is x 3 y 4 .
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