Class 12 Determinants · Mcq Single Correct1 Marksadjugate
Class 12 Maths · Determinants · Mcq Single Correct #14
A 3×3 matrix A satisfies A adj(A)=3I₃. Find det(A)+det(adj A).
✅ Step-by-Step Solution
Final Answer: Option (A): 12
- A adj(A)=det(A)I implies det(A)=3. For order 3, det(adj A)=det(A)²=9; the sum is 12.
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