If , then…

MATHEMATICS · Single correct · CBSE · Mathematics · Determinants · Determinants

Problem

If A=[−1−2−221−22−21]A=\begin{bmatrix}-1&-2&-2\\2&1&-2\\2&-2&1\end{bmatrix}, then adj⁡A\operatorname{adj}A equals (1) AA (2) ATA^T (3) 3A3A (4) 3AT3A^T

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