imo class 12 determinants

If the determinant |a b; c d| = 2, then |2a 2b; c d| equals:

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#IMO#Class 12#Mathematics#Determinants#mathematical-reasoning

If the determinant |a b; c d| = 2, then |2a 2b; c d| equals:

  • A. 2
  • B. 4
  • C. 6
  • D. 8

Answer: B) 4

Explanation: Taking 2 common from first row multiplies determinant by 2. So 2 × 2 = 4.

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