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Q: If the Highest Common Factor (HCF)of x and y is 15, then the HCF of 36x² – 81y² and 81x² – 9y² will be divisible by ______.
  • A. 180
  • B. 135
  • C. 90
  • D. 120
Correct Answer: Option B -
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Explanations:

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