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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 is divisible by __________

  • 1
    135
  • 2
    120
  • 3
    180
  • 4
    90
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Answer : 1. "135"

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