If A=\left[\begin{array}{ccc}a & 0 & 0 \ 0 & a & 0 \ 0 & 0 ...

CBSE Class 12 Math 2020 Outside Delhi Set 3 Solved Paper

Question : 2 of 11

Marks: +1, -0

If A=[

], then det(adj‌A) equals

Solution: 👈: Video Solution

a6
A=[

]
∴|A|=[

]=a3≠0
and
n=3
Thus, we have
|adj‌A|=|A|n−1=(a3)2=a6

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