Question
If A is a singular matrix, then A (adj A) is a.
- scalar matrix
- zero matrix
- identity matrix
- orthogonal matrix
✓
Answer
- zero matrix
Solution:
Given A is a singular matrix.
⇒ ∣A∣ = 0
A(adjA) = ∣A∣ I = 0I = O
∴ A(adjA) is a zero matrix.
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