question_answer

If (C, C) is the solution of system of equations \[\mathbf{mx}+\mathbf{n}\text{ }\mathbf{y}+\left( \mathbf{s}-\mathbf{t} \right)=\mathbf{0}\] and \[\mathbf{nx}+\mathbf{my}+\left( \mathbf{r}-\mathbf{s} \right)=\mathbf{0},\] \[\mathbf{(m}\ne \mathbf{n),}\] then

A) 2s = r + t    

B) 2r = s + t

C) 2t = r + s                                             

D) r = s + t

E) None of these