Q.

if P=1λ3133244 is the adj of a 3X3  matrix A and A=4,then λ=

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a

4

b

9

c

5

d

0

answer is B.

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Detailed Solution

We have∣ adj A|=P=|A2⇒1λ3133244=16⇒112-12-λ4-6+34-6=12⇒2λ=18⇒λ=9
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