શ્રેણિક ગુણાકારના સંદર્ભમાં સમૂહ $M = \left\{ \begin{bmatrix} x & x \\ x & x \end{bmatrix} \mid x \in \mathbb{R}, x \neq 0 \right\}$ માં તદેવ ઘટક (identity element) કયો છે?

  • A
    $\begin{bmatrix} 1 & 1 \\ 1 & 1 \end{bmatrix}$
  • B
    $\frac{1}{2} \begin{bmatrix} 1 & 1 \\ 1 & 1 \end{bmatrix}$
  • C
    $\begin{bmatrix} 1 & 0 \\ 0 & 1 \end{bmatrix}$
  • D
    $\begin{bmatrix} 0 & 1 \\ 1 & 0 \end{bmatrix}$

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નીચેનામાંથી કયું વિધાન સાચું નથી?

જો $\begin{bmatrix} 1 & x & 1 \end{bmatrix} \begin{bmatrix} 1 & 3 & 2 \\ 0 & 5 & 1 \\ 0 & 3 & 2 \end{bmatrix} \begin{bmatrix} 1 \\ 1 \\ x \end{bmatrix} = 0$ હોય,તો $2x + 9 =$ . . . . . .

$[x\,y\,z]\,\,\left[ {\begin{array}{*{20}{c}}a&h&g\\h&b&f\\g&f&c\end{array}} \right]\,\left[ \begin{array}{l}x\\y\\z\end{array} \right]$ નો ક્રમ (order) શું છે?

જો $A = \begin{bmatrix} 1 & 0 \\ 2 & 0 \end{bmatrix}$ અને $B = \begin{bmatrix} 0 & 0 \\ 1 & 12 \end{bmatrix}$ હોય,તો:

જો $A = \begin{bmatrix} 0 & 2 \\ 3 & -4 \end{bmatrix}$ અને $kA = \begin{bmatrix} 0 & 3a \\ 2b & 24 \end{bmatrix}$ હોય,તો $k, a, b$ ની કિંમતો અનુક્રમે શું થાય?

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