Test Academy | If A and B are invertible matrices, then which of the following is not correct? adj A = |A|.A⁻¹, det (a)⁻¹ = [det (a)]⁻¹, (AB)⁻¹ = B⁻¹A⁻¹, (A + B)⁻¹ = B⁻¹ + A⁻¹

Question

If A and B are invertible matrices, then which of the following is not correct?

Options :

adj A = |A|.A⁻¹
det (a)⁻¹ = [det (a)]⁻¹
(AB)⁻¹ = B⁻¹A⁻¹
(A + B)⁻¹ = B⁻¹ + A⁻¹

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