GATE Civil Engineering (CE) 2022 Shift 2 Solved Paper

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Question : 25 of 65

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P and Q are two square matrices of the same order. Which of the following statement(s) is/are correct?

If P and Q are invertible, then [PQ]^-1 = Q^-1P^-1
If P and Q are invertible, then [QP]-1 = P^-1Q-1
If P and Q are invertible, then [PQ]-1 = P-1Q-1
If P and Q are not invertible, then [PQ]-1 = Q-1P-1

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