If \[{{\Delta }_{1}}=\left| \,\begin{matrix} 1 & 0 \\ a & b \\ \end{matrix}\, \right|\] and \[{{\Delta }_{2}}=\left| \begin{matrix} 1 & 0 \\ c & d \\ \end{matrix} \right|\], then \[{{\Delta }_{2}}{{\Delta }_{1}}\]is equal to [RPET 1984]

If \[{{\Delta }_{1}}=\left| \,\begin{matrix} 1 & 0 \\ a &

1.	If \[{{\Delta }_{1}}=\left\| \,\begin{matrix} 1 & 0 \\ a & b \\ \end{matrix}\, \right\|\] and \[{{\Delta }_{2}}=\left\| \begin{matrix} 1 & 0 \\ c & d \\ \end{matrix} \right\|\], then \[{{\Delta }_{2}}{{\Delta }_{1}}\]is equal to [RPET 1984]
A.	ac
B.	bd
C.	\[(b-a)(d-c)\]
D.	None of these
Answer» C. \[(b-a)(d-c)\]

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If \[{{\Delta }_{1}}=\left| \,\begin{matrix} 1 & 0 \\ a & b \\ \end{matrix}\, \right|\] and \[{{\Delta }_{2}}=\left| \begin{matrix} 1 & 0 \\ c & d \\ \end{matrix} \right|\], then \[{{\Delta }_{2}}{{\Delta }_{1}}\]is equal to [RPET 1984]

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