If A= [ cc 1 & -1 2 & 3 ], then M_ 21 = - Vidyadip

MCQ

If $A=\left[\begin{array}{cc}1 & -1 \\ 2 & 3\end{array}\right]$, then $M_{21}=$

A
1
✓
-1
C
2
D
3

✓

Answer

Correct option: B.

-1

(B) The minor of element $a_{21}=M_{21}=-1$
$\ldots\left[\right.$ By leaving $R _2$ and $\left.C _1\right]$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "MCQ" from Matrics→Matrics — all question types→Maths STD 12 Science question papers→Maharashtra Board STD 12 Science question papers→Maharashtra Board question paper generator→

Similar questions

The domain of $\sin ^{-1}\left(\frac{2 x+1}{3}\right)$ is

The area of the region bounded by the curve $y=x|x|, X$-axis and the ordinates $x=1, x=-1$ is

Let $g(x) = 1 + x - [x]$ and $\text{f(x)}=\begin{cases}-1,&\text{x}<0\\0,&\text{x}=0\\1,&\text{x}>0\end{cases}$ where $[x]$ denotes the greatest integer less than or equal to $x.$ Then for all $x, f(g(x))$ is equal to:

The element of second row and third column in the inverse of $\left[\begin{array}{ccc}1 & 2 & 1 \\ 2 & 1 & 0 \\ -1 & 0 & 1\end{array}\right]$ is

The negation of the statement, $\exists x \in \mathrm{R}$, such that $x^2+3>0$, is.

$\int_0^{\pi / 4} \tan ^6 x \sec ^2 x d x=$

The difference between the slopes of the lines represented by $3 x^2-4 x y+y^2=0$ is_________

The points $A (-1,3,0), B (2,2,1)$ and $C (1,1,3)$ determine a plane. The distance from the plane to the point $D(5,7,8)$ is

The binary operation $^*$ is defined by $a ^* b = a^2 + b^2 + ab + 1$, then $(2 ^* 3) ^* 2$ is equal to:

If $3\sin^{-1}\Big(\frac{2\text{x}}{1+\text{x}^2}\Big)-4\cos^{-1}\Big(\frac{1-\text{x}^2}{1+\text{x}^2}\Big)+2\tan^{-1}\Big(\frac{2\text{x}}{1-\text{x}^2}\Big)=\frac{\pi}{3}$ is equal to: