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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