imo class 12 determinants

If the matrix [2 k; 4 8] is singular, then k equals:

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

If the matrix [2 k; 4 8] is singular, then k equals:

  • A. 4
  • B. 2
  • C. 8
  • D. 16

Answer: A) 4

Explanation: Singular → determinant = 0 → 16 − 4k = 0 → k = 4.

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