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If A = [(1, 0, 0), (0, 1, 0), (a, b, -1)], then A^2 is equal to (A) Unit matrix (B) Null matrix

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If A = [(1, 0, 0), (0, 1, 0), (a, b, -1)], then A2 is equal to

(A) Unit matrix

(B) Null matrix

(C) A

(D) -A

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Answer is (A) Unit matrix

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