If $\left| {\,\begin{array}{*{20}{c}}1&k&3\\3&k&{ – 2}\\2&3&{ – 1}\end{array}\,} \right| = 0$,then the value of $ k $ 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) = $. . . . .

The sum of distinct values of $\lambda$ for which the system of equations

$(\lambda-1) x+(3 \lambda+1) y+2 \lambda z=0$

$(\lambda-1) x+(4 \lambda-2) y+(\lambda+3) z=0$

$2 x+(3 \lambda+1) y+3(\lambda-1) z=0$

has non-zero solutions, is

Consider system of equations in $x$ , $y$ and $z$

$12x + by + cz = 0$ ;   $ax + 24y + cz = 0$  ;   $ax + by + 36z = 0$ .

(where $a$ , $b$ , $c$ are real numbers, $a \ne 12$ , $b \ne 24$ , $c \ne 36$ ).

If system of equation has solution and $z \ne 0$, then value of  $\frac{1}{{a – 12}} + \frac{2}{{b – 24}} + \frac{3}{{c – 36}}$ is

Let $\mathrm{A}(-1,1)$ and $\mathrm{B}(2,3)$ be two points and $\mathrm{P}$ be a variable point above the line $A B$ such that the area of $\triangle \mathrm{PAB}$ is $10$ . If the locus of $\mathrm{P}$ is $\mathrm{ax}+\mathrm{by}=15$, then $5 a+2 b$ is :