1
AP EAPCET 2025 - 21st May Morning Shift
MCQ (Single Correct Answer)
+1
-0

$A=\left[\begin{array}{ccc}1 & -1 & 2 \\ -2 & 3 & -3\end{array}\right]$ is the given matrix and $A^T$ represents the transpose of $A$, then $A A^T-A-A^T=$

A

$\left[\begin{array}{ccc}4 & 8 & 12 \\ 8 & 16 & -28 \\ 12 & -28 & 47\end{array}\right]$

B

$\left[\begin{array}{ccc}4 & -8 & 12 \\ -8 & 16 & -28 \\ 12 & -28 & 47\end{array}\right]$

C

$\left[\begin{array}{ccc}4 & -8 & 12 \\ -8 & 16 & 28 \\ 12 & 28 & 47\end{array}\right]$

D

$\left[\begin{array}{ccc}4 & -8 & -12 \\ -8 & 16 & -28 \\ -12 & -28 & 47\end{array}\right]$

2
AP EAPCET 2025 - 21st May Morning Shift
MCQ (Single Correct Answer)
+1
-0

If $A=\left[\begin{array}{ccc}x & 2 & 1 \\ -2 & y & 0 \\ 2 & 0 & -1\end{array}\right], x$ and $y$ are non-zero numbers, trace of $A=0$ and determinant of $A=-6$, then the minor of the elements 1 of $A$ is

A

-4

B

4

C

2

D

-2

3
AP EAPCET 2025 - 21st May Morning Shift
MCQ (Single Correct Answer)
+1
-0

If $i=\sqrt{-1}$, then $\sum\limits_{n=2}^{30} i^n+\sum\limits_{n=30}^{65} i^{n+3}=$

A

0

B

-1

C

i

D

-1

4
AP EAPCET 2025 - 21st May Morning Shift
MCQ (Single Correct Answer)
+1
-0

If $z_1$ and $z_2$ are two of the $n$th roots of unity such that the line segment joining them subtends at a right angle at the origin, then for a positive integer $k, n$ takes the form

A

$4 k$

B

$4 k+1$

C

$4 k+2$

D

$4 k+3$