1
JEE Main 2023 (Online) 10th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

If $$\mathrm{A}=\frac{1}{5 ! 6 ! 7 !}\left[\begin{array}{ccc}5 ! & 6 ! & 7 ! \\ 6 ! & 7 ! & 8 ! \\ 7 ! & 8 ! & 9 !\end{array}\right]$$, then $$|\operatorname{adj}(\operatorname{adj}(2 \mathrm{~A}))|$$ is equal to :

A
$$2^{12}$$
B
$$2^{20}$$
C
$$2^{8}$$
D
$$2^{16}$$
2
JEE Main 2023 (Online) 10th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

If A is a 3 $$\times$$ 3 matrix and $$|A| = 2$$, then $$|3\,adj\,(|3A|{A^2})|$$ is equal to :

A
$${3^{12}}\,.\,{6^{10}}$$
B
$${3^{11}}\,.\,{6^{10}}$$
C
$${3^{12}}\,.\,{6^{11}}$$
D
$${3^{10}}\,.\,{6^{11}}$$
3
JEE Main 2023 (Online) 10th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

For the system of linear equations

$$2x - y + 3z = 5$$

$$3x + 2y - z = 7$$

$$4x + 5y + \alpha z = \beta $$,

which of the following is NOT correct?

A
The system has infinitely many solutions for $$\alpha=-6$$ and $$\beta=9$$
B
The system has a unique solution for $$\alpha$$ $$ \ne $$ $$-5$$ and $$\beta=8$$
C
The system is inconsistent for $$\alpha=-5$$ and $$\beta=8$$
D
The system has infinitely many solutions for $$\alpha=-5$$ and $$\beta=9$$
4
JEE Main 2023 (Online) 8th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

If $$A=\left[\begin{array}{cc}1 & 5 \\ \lambda & 10\end{array}\right], \mathrm{A}^{-1}=\alpha \mathrm{A}+\beta \mathrm{I}$$ and $$\alpha+\beta=-2$$, then $$4 \alpha^{2}+\beta^{2}+\lambda^{2}$$ is equal to :

A
12
B
10
C
19
D
14
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