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    Maths-
    General
    Easy

    Question

    If A is square matrix such that A2 = A, then |A| equals-

    1. 0 or 1    
    2. –2 or 2    
    3. –3 or 3    
    4. None of these    

    The correct answer is: 0 or 1

      A2 = A
      |A2| = |A|
      |A|2 = |A|
      |A|2 – |A| = 0
      |A| [|A| –1] = 0 rightwards double arrow |A| = 0 or |A| = 1

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