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If A=[[a, b],[ c ,d]] , then a d j\ A is...

If `A=[[a, b],[ c ,d]]` , then `a d j\ A` is `[[-d,-b],[-c, a]]` (b) `[[d,-b],[-c ,a]]` (c) `[[d, b],[ c, a]]` (d) `[[d, c],[ b ,a]]`

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