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Matrices — Mathematics STD 10 — Question

ICSE BoardEnglish MediumSTD 10MathematicsMatrices1 Mark
MCQ
If $M =\left[\begin{array}{ll}1 & 2\end{array}\right]$ and $N =\left[\begin{array}{l}2 \\ 1\end{array}\right]$, then the order of matrix MN is:
  • A
    $1 \times 2$
  • B
    $2 \times 1$
  • C
    $2 \times 2$
  • ✓
    $1 \times 1$
✓

Answer

Correct option: D.
$1 \times 1$
(d) $1 \times 1$
Explanation:
$MN =\left[\begin{array}{ll}1 & 2]_{1 \times 2}\end{array}\left[\begin{array}{l}2 \\ 1\end{array}\right]_{2 \times 1}=[4]_{1 \times 1}\right.$

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