[ l , , ,1 - 1 , , ,2 ] , ,[2 , ,1 - 1] = - Vidyadip

MCQ

$\left[ \begin{array}{l}\,\,\,1\\ - 1\\\,\,\,2\end{array} \right]\,\,[2{\rm{ }}\,\,1{\rm{ }} - 1]$ =

A
$[-1]$
B
$\left[ \begin{array}{l}\,\,\,2\\ - 1\\ - 2\end{array} \right]$
✓
$\left[ {\begin{array}{*{20}{c}}{\,\,2}&{\,\,1}&{ - 1}\\{ - 2}&{ - 1}&{\,\,1}\\{\,\,4}&{\,\,2}&{ - 2}\end{array}} \right]$
D
Not defined

✓

Answer

Correct option: C.

$\left[ {\begin{array}{*{20}{c}}{\,\,2}&{\,\,1}&{ - 1}\\{ - 2}&{ - 1}&{\,\,1}\\{\,\,4}&{\,\,2}&{ - 2}\end{array}} \right]$

c
(c)$\left[ {\begin{array}{*{20}{c}}{\,\,1}\\{ - 1\,}\\{\,\,2}\end{array}} \right]\,\,[\begin{array}{*{20}{c}}2&1&{ - 1}\end{array}] = \left[ {\begin{array}{*{20}{c}}2&1&{ - 1}\\{ - 2\,\,\,}&{ - 1\,\,\,}&{\,\,1}\\4&2&{ - 2}\end{array}} \right]$.

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