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Model Paper 1 — MATHS STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceMATHSModel Paper 11 Mark
Question
If A is a 2-rowed square matrix and IAI = 6 then A adj A = ?
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Answer

(d) $\left[\begin{array}{ll}6 & 0 \\ 0 & 6\end{array}\right]$
Explanation:  A.(adj A) = |A|I
$=6\left(\begin{array}{ll}1 & 0 \\ 0 & 1\end{array}\right)$
$=\left(\begin{array}{ll}6 & 0 \\ 0 & 6\end{array}\right)$

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