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Q.

Let for A=123α31112,|A|=2, If |2adj(2adj(2A))|=32n, then 3n + α is equal to

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a

11

b

12

c

10

d

9

answer is D.

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Detailed Solution

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|A|=1(61)2(2α1)+3(α3)=54α+2+3α9=2α2=2α=4|2adj(2adj(2A))|=23|adj(2adj(2A))| =23|2adj(2A)|2=23232||adj(2A)2=29|2A|4=29234|A|4=2921224=225=255=325,  n=53n+α=154=11

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Let for A=123α31112,|A|=2, If |2adj⁡(2adj⁡(2A))|=32n, then 3n + α is equal to