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If matrix A = [aij]2 × 2, where aij = {1 if i ≠ j, 0 if i = j}

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If matrix A = [aij]2 × 2, where aij = {1 if i ≠ j,   0 if i = j} then A2 is equal to

(A) I

(B) A 

(C) 0 

(D) None of these

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Answer is (A)

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