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If A is an 3 x3 non-singular matrix such...

If `A` is an `3 x3` non-singular matrix such that `A A^(prime)=A^(prime)A` and `B=A^(-1)A^(prime),` then `B B '` equals:

A

`B^(-1)`

B

`(B^(-1))`

C

`1+B`

D

1

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The correct Answer is:
d
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