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Easy

Question

# If AB = I and B = A' then :

- A
^{–1} = A'
- A
^{–1} = A
- A
^{–1} = A^{2}
- None

^{–1}= A'^{–1}= A^{–1}= A^{2}## The correct answer is: A^{–1} = A'

### A . B = I B = A^{–1}

Also B = A' A^{–1} = A'

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