1
MHT CET 2021 21th September Morning Shift
+2
-0

$$\mathrm{A}^{-1}=\frac{-1}{2}\left[\begin{array}{cc}1 & -4 \\ -1 & 2\end{array}\right]$$, then $$2 A+I_2=\quad$$

where $$I_2$$ is a unit matrix of order 2

A
$$\left[\begin{array}{ll}5 & 8 \\ 1 & 2\end{array}\right]$$
B
$$\left[\begin{array}{ll}5 & 8 \\ 2 & 2\end{array}\right]$$
C
$$\left[\begin{array}{ll}2 & 4 \\ 1 & 1\end{array}\right]$$
D
$$\left[\begin{array}{ll}5 & 8 \\ 2 & 3\end{array}\right]$$
2
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
$$-13,-6,5$$
3
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
$$\left[\begin{array}{ccc}-5 & 20 & -2 \\ 1 & 3 & 0 \\ 3 & 11 & 1\end{array}\right]$$
4
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
$$\left[\begin{array}{cc}2 & 3 \\ 7 & -11\end{array}\right]$$
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