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Home  >>  CBSE XII  >>  Math  >>  Model Papers
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If A is square matrix of order 3 such that | adj.A |=81, find | A |.

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|adjA|^n=|A|^n-1 Given |adjA|=81 81=3^4 Hence |A| =3^3=27 Therefore|A|=27
answered Nov 30, 2013 by vijayalakshmi_ramakrishnans
i think the answer is 9.check it out!
 
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