The value of \(\left| {\begin{array}{*{20}{c}} 1&1&1\\ 1&{1 + {\rm{x}}}&1\\ 1&1&{1 + {\rm{y}}} \end{array}} \right|\) is

The value of \(\left| {\begin{array}{*{20}{c}} 1&1&1\\ 1&{1 + {\rm{x}}

1.	The value of \(\left\| {\begin{array}{*{20}{c}} 1&1&1\\ 1&{1 + {\rm{x}}}&1\\ 1&1&{1 + {\rm{y}}} \end{array}} \right\|\) is
A.	x + y
B.	x – y
C.	xy
D.	1 + x + y
Answer» D. 1 + x + y