If $a$, $b$, $c$, $d$, $e$, $f$ are in $G.P$., then the value of $\left| {\begin{array}{*{20}{c}}
  {{a^2}}&{{d^2}}&x \\ 
  {{b^2}}&{{e^2}}&y \\ 
  {{c^2}}&{{f^2}}&z 
\end{array}} \right|$ depends on

The ordered pair $(a, b)$, for which the system of linear equations  $3 x-2 y+z=b$  ;  $5 x-8 y+9 z=3$  ;  $2 x+y+a z=-1$ has no solution, is

The number of solutions of the system of equations $2x + y – z = 7,\,\,x – 3y + 2z = 1,\,x + 4y – 3z = 5$ is

If $\left| {\begin{array}{*{20}{c}}{x – 4}&{2x}&{2x}\\{2x}&{x – 4}&{2x}\\{2x}&{2x}&{x – 4}\end{array}} \right| = \left( {A + Bx} \right){\left( {x – A} \right)^2},$ then the ordered pair $\left( {A,B} \right) = $. . . . .

If $a_i^2 + b_i^2 + c_i^2 = 1,\,i = 1,2,3$ and $a_ia_j + b_ib_j +c_ic_j = 0$ $\left( {i \ne j,i,j = 1,2,3} \right)$ then the value of determinant $\left| {\begin{array}{*{20}{c}}
  {{a_1}}&{{a_2}}&{{a_3}} \\ 
  {{b_1}}&{{b_2}}&{{b_3}} \\ 
  {{c_1}}&{{c_2}}&{{c_3}} 
\end{array}} \right|$ is