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If A and B are square matrices of order ...

If A and B are square matrices of order 3, then

A

` adj (AB) =adjA + adj B `

B

`(A+B) =A^(-1) +B^(-1) `

C

` AB= O rArr | A| =0 or [B] =0`

D

` AB = OrArr |A| =0 and |B| =0`

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The correct Answer is:
C
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