\[\left| \,\begin{matrix} 1 & 1 & 1 \\ 1 & 1+x & 1 \\ 1 & 1 & 1+y \\ \end{matrix}\, \right|=\] [RPET 1996]

\[\left| \,\begin{matrix} 1 & 1 & 1 \\ 1 & 1+x & 1 \\

1.	\[\left\| \,\begin{matrix} 1 & 1 & 1 \\ 1 & 1+x & 1 \\ 1 & 1 & 1+y \\ \end{matrix}\, \right\|=\] [RPET 1996]
A.	1
B.	0
C.	x
D.	xy
Answer» E.

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\[\left| \,\begin{matrix} 1 & 1 & 1 \\ 1 & 1+x & 1 \\ 1 & 1 & 1+y \\ \end{matrix}\, \right|=\] [RPET 1996]

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