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Question

If $A equals open square brackets table row 0 1 row 0 0 end table close square brackets$ and $A B equals O$ , then B =

$[\begin{matrix} 1 & 1 \\ 1 & 1 \end{matrix}]$
$[\begin{matrix} 0 & 1 \\ - 1 & 0 \end{matrix}]$
$[\begin{matrix} 0 & - 1 \\ 1 & 0 \end{matrix}]$
$[\begin{matrix} - 1 & 0 \\ 0 & 0 \end{matrix}]$

The correct answer is: $open square brackets table row cell negative 1 end cell 0 row 0 0 end table close square brackets$

Since $open square brackets table row 0 1 row 0 0 end table close square brackets open square brackets table row cell negative 1 end cell 0 row 0 0 end table close square brackets equals open square brackets table row 0 0 row 0 0 end table close square brackets equals O equals A B$
Þ $B equals open square brackets table row cell negative 1 end cell 0 row 0 0 end table close square brackets$

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