1
MHT CET 2021 20th September Morning Shift
MCQ (Single Correct Answer)
+2
-0

If inverse of $$\left[\begin{array}{ccc}1 & 2 & x \\ 4 & -1 & 7 \\ 2 & 4 & -6\end{array}\right]$$ does not exist, then $$x=$$

A
$$-$$3
B
2
C
3
D
0
2
MHT CET 2021 20th September Morning Shift
MCQ (Single Correct Answer)
+2
-0

If $$A = \left[ {\matrix{ 3 & 2 & 4 \cr 1 & 2 & 1 \cr 3 & 2 & 6 \cr } } \right]$$ and A$$_{ij}$$ are cofactors of the elements a$$_{ij}$$ of A, then $${a_{11}}{A_{11}} + {a_{12}}{A_{12}} + {a_{13}}{A_{13}}$$ is equal to

A
8
B
6
C
4
D
0
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