Question:
Mark the tick against the correct answer in the following:
$\left|\begin{array}{ccc}1 & 1 & 1 \\ 1 & 1+x & 1 \\ 1 & 1 & 1+y\end{array}\right|=?$
A. $(x+y)$
B. $(x-y)$
C. $x y$
D. none of these
Solution:
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