A) 2
B) 0
C) -1
D) -2
Correct Answer: D
Solution :
\[\left| \begin{matrix} p & 1 & 1 \\ 1 & q & 1 \\ 1 & 1 & r \\ \end{matrix} \right|=0\] \[\Rightarrow \]\[p(qr-1)+1(1-r)+1(1-q)=0\] \[\Rightarrow \]\[pqr-p+1-r+1-q=0\] \[\Rightarrow \]\[pqr-(p+q+r)=-2\]You need to login to perform this action.
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