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Question
If A = `[(a, 0, 0),(0, a, 0),(0, 0, a)]`, then det (adj A) equals
Options
a27
a9
a6
a2
MCQ
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Solution
a6
Explanation:
A = `[(a, 0, 0),(0, a, 0),(0, 0, a)]`
Det (A) = a(a × a – 0 × 0) – 0 + 0
= a3
Det (adj A) = (a3)2
= a6
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