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WBJEE 2019 Math Solved Paper

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Question : 34

Total: 75

Let A and B be two square matrices of order 3 and AB = O3, where O3 denotes the null matrix of order 3. Then

must be A = O3, B = O3
if A ≠ O3, must be B ≠ O3
if A = O3, must be B ≠ O3
may be A ≠ O3, B ≠ O3

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