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Q: The equation ax² + 2hxy + by² = 0 will represent a pair of perpendicular lines, then समीकरण ax² + 2hxy + by² = 0 दो लम्बवत रेखा युग्म को प्रदर्शित करेगा–
  • A. ab = 0
  • B. ab – h² = 0
  • C. a + b = 0
  • D. a – b = 0
Correct Answer: Option C -
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Explanations:

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