If \(A\) is a square matrix of order 3 with \(|A|=4\), then \(|\operatorname{adj}(2A)|\) is
A. 64
B. 1024
C. 128
D. 256
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Best answer
Answer: B. 1024
\(|2A|=2^3\cdot4=32\); \(|\operatorname{adj}B|=|B|^{2}\) for order 3, so \(32^2=1024\).
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· 23 Oct 2026
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