[ * 20 c 7&1&2 9&2&1 ] , [ l 3 4 5 ] + 2 [ l 4 2 ] is equal to - Vidyadip

MCQ

$\left[ {\begin{array}{*{20}{c}}7&1&2\\9&2&1\end{array}} \right]\,\left[ \begin{array}{l}3\\4\\5\end{array} \right] + 2\left[ \begin{array}{l}4\\2\end{array} \right]$ is equal to

✓
$\left[ \begin{array}{l}43\\44\end{array} \right]$
B
$\left[ \begin{array}{l}43\\45\end{array} \right]$
C
$\left[ \begin{array}{l}45\\44\end{array} \right]$
D
$\left[ \begin{array}{l}44\\45\end{array} \right]$

✓

Answer

Correct option: A.

$\left[ \begin{array}{l}43\\44\end{array} \right]$

a
(a) $\left[ {\begin{array}{*{20}{c}}7&1&2\\9&2&1\end{array}} \right]\,\left[ {\begin{array}{*{20}{c}}3\\4\\5\end{array}} \right]\, = \,\,\left[ {\begin{array}{*{20}{c}}{35}\\{40}\end{array}} \right]$;

$\therefore$ $\left[ {\begin{array}{*{20}{c}}{35}\\{40}\end{array}} \right]\, + \,\left[ {\begin{array}{*{20}{c}}8\\4\end{array}} \right]\, = \,\left[ {\begin{array}{*{20}{c}}{43}\\{44}\end{array}} \right]$.

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 "M.C.Q (1 Marks)" from STD 12 - 3 and 4 . determinant and metrices→STD 12 - 3 and 4 . determinant and metrices — all question types→Mathematics STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

A random variable has the following probability distribution:

$X = x_i$	$0$	$1$	$2$	$3$	$4$	$5$	$6$	$7$
$P(X = X_i)$	$0$	$2p$	$2p$	$3p$	$p^2$	$2p^2$	$7p^2$	$2p$

The normal to the curve $x^2 = 4y$ passing through $(1, 2)$ is :

The value of $\int \limits_{\frac{\pi}{3}}^{\frac{\pi}{2}} \frac{(2+3 \sin x)}{\sin x(1+\cos x)} d x$ is equal to

Choose the correct answer in the following.
The area bounded by the curve y = x|x|, x-axis and the ordinates x = -1 and x = 1 is given by,

Three numbers are chosen at random, one after another with replacement, from the set $S=\{1,2,3, \ldots, 100\}$. Let $p_1$ be the probability that the maximum of chosen numbers is at least 81 and $p _2$ be the probability that the minimum of chosen numbers is at most $40$ .

($1$) The value of $\frac{625}{4} p _1$ is

($2$) The value of $\frac{125}{4} p _2$ is

Give the answer or queution ($1$) and ($2$)

The roots of the equation $\left| {\,\begin{array}{*{20}{c}}{x - 1}&1&1\\1&{x - 1}&1\\1&1&{x - 1}\end{array}\,} \right| = 0$ are

The value of a for which the system of equations ${a^3}x + {(a + 1)^3}y + {(a + 2)^3}z = 0,$ $ax + (a + 1)y + (a + 2)z = 0,$ $x + y + z = 0,$ has a non zero solution is

The area bounded by the parabola ${y^2} = 4ax,$ its axis and two ordinates $x = 4,$ $x = 9$ is

Let $f:\left[ {0,2} \right] \to R$ be a twice differentiable function such that $f''\left( x \right) > 0$, for all $x \in \left( {0,2} \right)$. If $\phi \left( x \right) = f\left( x \right) + f\left( {2 - x} \right)$, then $\phi $ is

If $u = {x^2} + {y^2}$ and $x = s + 3t,$$y = 2s - t,$ then ${{{d^2}u} \over {d{s^2}}} = $