imo class 12 determinants

For any square matrix A of order n, A(adj A) is equal to:

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

For any square matrix A of order n, A(adj A) is equal to:

  • A. |A|I
  • B. adj A
  • C. I
  • D. |A|²I

Answer: A) |A|I

Explanation: A fundamental property of the adjoint matrix is A(adj A) = (adj A)A = |A|I.

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