If the vertices of a triangle are $(-2, 6)$,$(3, -6)$,and $(1, 5)$,then the area of the triangle is

  • A
    $40$ sq. units
  • B
    $15.5$ sq. units
  • C
    $30$ sq. units
  • D
    $35$ sq. units

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Evaluate $\left|\begin{array}{cc}x & x+1 \\ x-1 & x\end{array}\right|$

The number of real values of $t$ such that the system of homogeneous equations
$\begin{aligned}
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has non-trivial solutions is

If $a, b, c$ are distinct and $\left| \begin{array}{ccc} a & a^2 & a^3 - 1 \\ b & b^2 & b^3 - 1 \\ c & c^2 & c^3 - 1 \end{array} \right| = 0$,then

If $x$ is a positive integer,then $\Delta = \left| \begin{array}{ccc} x! & (x+1)! & (x+2)! \\ (x+1)! & (x+2)! & (x+3)! \\ (x+2)! & (x+3)! & (x+4)! \end{array} \right|$ is equal to

Difficult
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Evaluate $\Delta = \begin{vmatrix} 1 & a & bc \\ 1 & b & ca \\ 1 & c & ab \end{vmatrix}$

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