$I{\text{f}}\,\,A = \left[ {123} \right],\,\,B = \left[ \begin{gathered} 2 \hfill \\ 3 \hfill \\ 4 \hfill \\ \end{gathered} \right]\,\,{\text{and}}\,\,C = \left[ {\begin{array}{*{20}{c}} 1&5 \\ 0&2 \end{array}} \right],\,\,{\text{then}}\,\,{\text{which}}\,\,{\text{of}}\;\,{\text{the}}$ following is defined

$(\mathrm{AC}) \cdot \mathrm{B}$

$(\mathrm{AB}) \cdot \mathrm{C}$

JEE MATHEMATICS MCQ: MATRICES

1 Easy

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Application +4 | -1

I{\text{f}}\,\,A = \left[ {123} \right],\,\,B = \left[ \begin{gathered} 2 \quad \\ 3 \quad \\ 4 \quad \\ \end{gathered} \right]\,\,{\text{and}}\,\,C = \left[ {\begin{array}{cccccccccccccccccccc} 1&5 \\ 0&2 \end{array}} \right],\,\,{\text{then}}\,\,{\text{which}}\,\,{\text{of}}\;\,{\text{the}}

following is defined

View answer and explanation

Correct option: A

\mathrm{AB}

Option A (AB) is correct because the number of columns in A matches the number of rows in B, making matrix multiplication AB defined.

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\left|\begin{array}{ccc}a & b-c & b+c \\ c+a & b & c-a \\ a-b & a+b & c\end{array}\right|=0

a, b, c

a x+b y+c=0

{x_2} - {x_3} = 1,\; - {x_1} + 2{x_3} = - 2,\;{x_1} - 2,\;{x_1} - 2{x_2} = 3

2x + 3y + 1 = 0,3x + y - 2 = 0

ax + 2y - b = 0

\left|\begin{array}{ccc}1 & \left(\alpha^{2 x}-\alpha^{-2 x}\right)^2 & \left(\alpha^{2 x}+\alpha^{-2 x}\right)^2 \\ 1 & \left(\beta^{2 x}-\beta^{-2 x}\right)^2 & \left(\beta^{2 x}+\beta^{-2 x}\right)^2 \\ 1 & \left(\gamma^{2 x}-\gamma^{-2 x}\right)^2 & \left(\gamma^{2 x}+\gamma^{-2 x}\right)^2\end{array}\right|

\omega

\left| {\begin{array}{cccccccccccccccccccc} 1&\omega &{{\omega ^2}}\\ \omega &{{\omega ^2}}&1\\ {{\omega ^2}}&1&\omega \end{array}} \right|

A

2 \times 2

A(\operatorname{adj} A)=\left[\begin{array}{cc}10 & 0 \\ 0 & 10\end{array}\right]

|A|