શૂન્યતર $a, b, c$ માટે,જો $\Delta = \begin{vmatrix} 1 + a & 1 & 1 \\ 1 & 1 + b & 1 \\ 1 & 1 & 1 + c \end{vmatrix} = 0$ હોય,તો $\frac{1}{a} + \frac{1}{b} + \frac{1}{c}$ ની કિંમત =

  • A
    $abc$
  • B
    $\frac{1}{abc}$
  • C
    $-(a + b + c)$
  • D
    $-1$

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જો $\theta \in \left(0, \frac{\pi}{2}\right)$ હોય,તો $\left|\begin{array}{ccc} (\sin \theta+\operatorname{cosec} \theta)^2 & (\sin \theta-\operatorname{cosec} \theta)^2 & 2020 \\ (\cos \theta+\sec \theta)^2 & (\cos \theta-\sec \theta)^2 & 2020 \\ (\tan \theta+\cot \theta)^2 & (\tan \theta-\cot \theta)^2 & 2020 \end{array}\right| = $

જો $\left|\begin{array}{ccc}x & x^2 & 1+x^3 \\ y & y^2 & 1+y^3 \\ z & z^2 & 1+z^3\end{array}\right|=0$ અને $x \neq y \neq z$ હોય, તો $1+x y z$ ની કિંમત શોધો.

જો $a - 2b + c = 1$ હોય,તો $\left| \begin{array}{ccc} x + 1 & x + 2 & x + a \\ x + 2 & x + 3 & x + b \\ x + 3 & x + 4 & x + c \end{array} \right|$ નું મૂલ્ય શું થાય?

જો $a, b, c$ બધા અલગ હોય અને $\left| \begin{array}{ccc} a & a^3 & a^4 - 1 \\ b & b^3 & b^4 - 1 \\ c & c^3 & c^4 - 1 \end{array} \right| = 0$ હોય,તો:

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નિશ્ચાયકનું મૂલ્ય શોધો: $\left| \begin{array}{ccc} a_1 & m a_1 & b_1 \\ a_2 & m a_2 & b_2 \\ a_3 & m a_3 & b_3 \end{array} \right|$

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