1
JEE Main 2023 (Online) 1st February Evening Shift
+4
-1

If $$A = {1 \over 2}\left[ {\matrix{ 1 & {\sqrt 3 } \cr { - \sqrt 3 } & 1 \cr } } \right]$$, then :

A
$$\mathrm{A^{30}-A^{25}=2I}$$
B
$$\mathrm{A^{30}+A^{25}-A=I}$$
C
$$\mathrm{A^{30}=A^{25}}$$
D
$$\mathrm{A^{30}+A^{25}+A=I}$$
2
JEE Main 2023 (Online) 1st February Morning Shift
+4
-1

Let $$S$$ denote the set of all real values of $$\lambda$$ such that the system of equations

$$\lambda x+y+z=1$$

$$x+\lambda y+z=1$$

$$x+y+\lambda z=1$$

is inconsistent, then $$\sum_\limits{\lambda \in S}\left(|\lambda|^{2}+|\lambda|\right)$$ is equal to

A
12
B
2
C
4
D
6
3
JEE Main 2023 (Online) 31st January Morning Shift
+4
-1

For the system of linear equations

$$x+y+z=6$$

$$\alpha x+\beta y+7 z=3$$

$$x+2 y+3 z=14$$

which of the following is NOT true ?

A
If $$\alpha=\beta=7$$, then the system has no solution
B
For every point $$(\alpha, \beta) \neq(7,7)$$ on the line $$x-2 y+7=0$$, the system has infinitely many solutions
C
There is a unique point $$(\alpha, \beta)$$ on the line $$x+2 y+18=0$$ for which the system has infinitely many solutions
D
If $$\alpha=\beta$$ and $$\alpha \neq 7$$, then the system has a unique solution
4
JEE Main 2023 (Online) 31st January Morning Shift
+4
-1

Let $$A = \left( {\matrix{ 1 & 0 & 0 \cr 0 & 4 & { - 1} \cr 0 & {12} & { - 3} \cr } } \right)$$. Then the sum of the diagonal elements of the matrix $${(A + I)^{11}}$$ is equal to :

A
4094
B
2050
C
6144
D
4097
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