A square matrix A is called an idempotent matrix if:
A square matrix A is called an idempotent matrix if:
- A. A² = O
- B. A² = I
- C. A² = A
- D. A³ = A
Answer: C) A² = A
Explanation: By mathematical definition, an idempotent matrix remains unchanged when multiplied by itself, hence A² = A.
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