1
MHT CET 2021 20th September Evening Shift
+2
-0

The co-factors of the elements of second column of $$\left[\begin{array}{ccc}1 & -1 & 2 \\ 3 & 2 & 1 \\ -1 & 3 & 4\end{array}\right]$$ are

A
$$-13,6,5$$
B
$$13,5,6$$
C
$$13,-6,-5$$
D
$$-13,-6,5$$
2
MHT CET 2021 20th September Evening Shift
+2
-0

If $$A^{-1}=\left[\begin{array}{lll}3 & 2 & 6 \\ 1 & 1 & 2 \\ 2 & 5 & 5\end{array}\right]$$, then $$A=$$

A
$$\left[\begin{array}{ccc}-5 & 20 & -2 \\ -1 & 3 & 0 \\ 3 & -11 & 1\end{array}\right]$$
B
$$\left[\begin{array}{ccc}-5 & 20 & 2 \\ -1 & 3 & 0 \\ 3 & 11 & 1\end{array}\right]$$
C
$$\left[\begin{array}{ccc}-5 & 20 & 2 \\ 1 & 3 & 0 \\ 3 & 11 & -1\end{array}\right]$$
D
$$\left[\begin{array}{ccc}-5 & 20 & -2 \\ 1 & 3 & 0 \\ 3 & 11 & 1\end{array}\right]$$
3
MHT CET 2021 20th September Evening Shift
+2
-0

If $$A^{-1}=\left[\begin{array}{cc}2 & -3 \\ -1 & 2\end{array}\right]$$ and $$B^{-1}=\left[\begin{array}{cc}1 & 0 \\ -3 & 1\end{array}\right]$$, then $$(A B)^{-1}=$$

A
$$\left[\begin{array}{cc}2 & 7 \\ 3 & -1\end{array}\right]$$
B
$$\left[\begin{array}{cc}2 & -7 \\ -3 & 11\end{array}\right]$$
C
$$\left[\begin{array}{cc}2 & -3 \\ -7 & 11\end{array}\right]$$
D
$$\left[\begin{array}{cc}2 & 3 \\ 7 & -11\end{array}\right]$$
4
MHT CET 2021 20th September Morning Shift
+2
-0

$$A(\propto)=\left[\begin{array}{cc}\cos \propto & \sin \propto \\ -\sin \propto & \cos \propto\end{array}\right]$$, then $$\left[A^2(\propto)\right]^{-1}=$$

A
$$\mathrm{A}(\propto)$$
B
$$\mathrm{A}^2(\propto)$$
C
$$\mathrm{A}(-2 \propto)$$
D
$$\mathrm{A}(2 \propto)$$
EXAM MAP
Medical
NEET