MCQ
If $A = \left[ {\begin{array}{*{20}{c}}4&2\\3&4\end{array}} \right]$,then $|adj\,\,A|$is equal to
- A$16$
- ✓$10$
- C$6$
- DNone of these
✓
Answer
Correct option: B.
$10$
b
(b) $A = \left[ {\begin{array}{*{20}{c}}4&{ 2}\\{ 3}&4\end{array}} \right]$
(b) $A = \left[ {\begin{array}{*{20}{c}}4&{ 2}\\{ 3}&4\end{array}} \right]$
adj $A = \left[ {\begin{array}{*{20}{c}}4&{ - 2}\\{ - 3}&4\end{array}} \right]$
$|adj\,A|\, = (4 \times 4) - ( - 3 \times - 2) = 16 - 6$
$|adj\,A|\,\, = 10.$
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