alleryFor matrix A and its adjugate adj(A): A × adj(A) =
AI
B|A| × I
C0
DA^T
Answer & Solution
Correct answer: B. |A| × I
A × adj(A) = |A| × I. Hence A⁻¹ = adj(A)/|A| when |A| ≠ 0. adj(A) is transpose of cofactor matrix.
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