જો $2^{a_1}, 2^{a_2}, 2^{a_3}, \dots, 2^{a_n}$ એ $G.P.$ માં હોય,તો નિશ્ચાયક $\left| \begin{array}{ccc} a_1 & a_2 & a_3 \\ a_{n+1} & a_{n+2} & a_{n+3} \\ a_{2n+1} & a_{2n+2} & a_{2n+3} \end{array} \right|$ ની કિંમત શું થાય?

  • A
    $2$
  • B
    $2^3$
  • C
    $0$
  • D
    કોઈ નહીં

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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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જો $\omega$ એ એકમનું કાલ્પનિક ઘનમૂળ હોય,તો નિશ્ચાયક $\left| \begin{array}{ccc} 1 & \omega^3 & \omega^2 \\ \omega^3 & 1 & \omega \\ \omega^2 & \omega & 1 \end{array} \right|$ નું મૂલ્ય શું થાય?

જો $\left| \begin{array}{ccc} y + z & x & y \\ z + x & z & x \\ x + y & y & z \end{array} \right| = k(x + y + z)(x - z)^2$ હોય,તો $k = $

જો $a \ne p, b \ne q, c \ne r$ અને $\begin{vmatrix} p & b & c \\ p + a & q + b & 2c \\ a & b & r \end{vmatrix} = 0$ હોય,તો $\frac{p}{p - a} + \frac{q}{q - b} + \frac{r}{r - c} = $

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જો ${D_r} = \left| \begin{array}{ccc} {2^{r - 1}} & {2 \cdot 3^{r - 1}} & {4 \cdot 5^{r - 1}} \\ x & y & z \\ {2^n} - 1 & {3^n} - 1 & {5^n} - 1 \end{array} \right|$ હોય,તો $\sum\limits_{r = 1}^n {D_r} = $ ની કિંમત શોધો.

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