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Q.

Let A=mnpq,d=|A|0 and |Ad(Adj A)|=0 . Then

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a

1+d2=m2+q2

b

(1+d)2=(m+q)2

c

(1+d)2=m2+q2

d

1+d2=(m+q)2

answer is B.

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Detailed Solution

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Here d=mq-pn
|Ad(Adj A)|=0|(mnpq)d(qnpm)|=0|(mdqn+dnp+dpqdm)|=0(maq)(qdm)pn(1+d)2=0mqdm2dq2+d2qm=pn+pnd2+2pndd+d3=d(m2+q2+2(mqd))d+d3=d(m2+q2+2mq)2d2(1+d)2=(m+q)2

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