Question:
Mark the tick against the correct answer in the following:
$\left|\begin{array}{ccc}1 & 1+p & 1+p+q \\ 2 & 3+2 p & 1+3 p+2 q \\ 3 & 6+3 p & 1+6 p+3 q\end{array}\right|=?$
A. 0
B. 1
C. $-1$
D. none of these
Solution:
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