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Jee Advanced

Matrices And Determinants

JEE Advanced 2024 Paper 1 Online

MCQ+3 / -12024
Let $\alpha$ and $\beta$ be the distinct roots of the equation $x^2+x-1=0$. Consider the set $T=\{1, \alpha, \beta\}$. For a $3 \times 3$ matrix $M=\left(a_{i j}\right)_{3 \times 3}$, define $R_i=a_{i 1}+a_{i 2}+a_{i 3}$ and $C_j=a_{1 j}+a_{2 j}+a_{3 j}$ for $i=1,2,3$ and $j=1,2,3$.



Match each entry in List-I to the correct entry in List-II.



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List-I List-II
(P) The number of matrices $ M = (a_{ij})_{3x3} $ with all entries in $ T $ such that $ R_i = C_j = 0 $ for all $ i, j $, is (1) 1
(Q) The number of symmetric matrices $ M = (a_{ij})_{3x3} $ with all entries in $ T $ such that $ C_j = 0 $ for all $ j $, is (2) 12
(R) Let $ M = (a_{ij})_{3x3} $ be a skew symmetric matrix such that $ a_{ij} \in T $ for $ i > j $.

Then the number of elements in the set


$ \left\{
\begin{pmatrix}
x \\
y \\
z
\end{pmatrix} : x, y, z \in \mathbb{R}, M
\begin{pmatrix}
x \\
y \\
z
\end{pmatrix} =
\begin{pmatrix}
a_{12} \\
0 \\

a_{13}
\end{pmatrix}
\right\} $
is
(3) infinite
(S) Let $ M = (a_{ij})_{3x3} $ be a matrix with all entries in $ T $ such that $ R_i = 0 $ for all $ i $. Then the absolute value of the determinant of $ M $ is (4) 6


The correct option is

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