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If $(1 2 3) B = (3 4)$ then order of the matrix B is

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$3 \times 1$

$2 \times 4$

$3 \times 2$

$5 \times 2$

answer is B.

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Detailed Solution

$\begin{matrix} (1 2 3) B = (3 4) \\ ↓ ↓ \\ (1 \times 3) (1 \times 2) \end{matrix}$

$\Rightarrow$ Order of B = $3 \times 2$

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