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Question

Let A, B, C, D be n × n matrices, each with non-­zero determinant. If ABCD = 1, then B^-1 is

a.

D^-1C^-1A^-1

b.

CDA

c.

ADC

d.

Does not necessarily exist

Answer: (b).CDA

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Q. Let A, B, C, D be n × n matrices, each with non-­zero determinant. If ABCD = 1, then B^-1 is

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