$\left| \begin{array}{ccc} 1 & 1 & 1 \\ 1 & \omega^2 & \omega \\ 1 & \omega & \omega^2 \end{array} \right| = $

  • A
    $3\sqrt{3}i$
  • B
    $-3\sqrt{3}i$
  • C
    $i\sqrt{3}$
  • D
    $3$

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જો $60 \hat{i}+3 \hat{j}$,$40 \hat{i}-8 \hat{j}$ અને $a \hat{i}-52 \hat{j}$ સ્થાન સદિશો ધરાવતા બિંદુઓ સમરેખ હોય,તો $a$ ની કિંમત શોધો.

જો $A, B, C$ એ ત્રિકોણના ખૂણા હોય,તો $\left| \begin{array}{ccc} -1 & \cos C & \cos B \\ \cos C & -1 & \cos A \\ \cos B & \cos A & -1 \end{array} \right| = $

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જો $a, b, c$ શૂન્યતર વાસ્તવિક સંખ્યાઓ હોય અને જો સમીકરણો $(a-1) x=y+z, (b-1) y=z+x, (c-1) z=x+y$ નો ઉકેલ શૂન્યતર (non-trivial) હોય,તો $ab+bc+ca=$

જો $a+b+c= S$ હોય,તો $\left|\begin{array}{ccc} S+c & a & b \\ c & S+a & b \\ c & a & S+b \end{array}\right|$ નું મૂલ્ય . . . . . . છે.

જો $\left|\begin{array}{ccc}x & 4 & 6 \\ 2 & 3 & -9 \\ 5 & 6 & 1\end{array}\right|+\left|\begin{array}{ccc}5 & 6 & 1 \\ 6 & 4 & 5 \\ 2 & 3 & -9\end{array}\right|=\left|\begin{array}{ccc}2 & 3 & -9 \\ 1-2 x & -8 & -11 \\ 5 & 6 & 1\end{array}\right|$ હોય,તો $x=$ . . . . . .

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