જો $x, y, z$ સમાન ન હોય અને $\neq 0, \neq 1$ હોય,તો $\begin{vmatrix} \log x & \log y & \log z \\ \log 2x & \log 2y & \log 2z \\ \log 3x & \log 3y & \log 3z \end{vmatrix}$ નું મૂલ્ય કેટલું થાય?

  • A
    $\log (xyz)$
  • B
    $\log (6 \times yz)$
  • C
    $0$
  • D
    $\log (x + y + z)$

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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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ધારો કે $A = \begin{bmatrix} 1 + x^2 - y^2 - z^2 & 2(xy + z) & 2(zx - y) \\ 2(xy - z) & 1 + y^2 - z^2 - x^2 & 2(yz + x) \\ 2(zx + y) & 2(yz - x) & 1 + z^2 - x^2 - y^2 \end{bmatrix}$. તો $\det(A)$ બરાબર છે:

સાબિત કરો કે $\Delta = \left| \begin{array}{ccc} a+bx & c+dx & p+qx \\ ax+b & cx+d & px+q \\ u & v & w \end{array} \right| = (1-x^2) \left| \begin{array}{ccc} a & c & p \\ b & d & q \\ u & v & w \end{array} \right|$

જો $a, b$ અને $c$ શૂન્યતર સંખ્યાઓ હોય,તો $\Delta = \left| \begin{array}{ccc} b^2c^2 & bc & b+c \\ c^2a^2 & ca & c+a \\ a^2b^2 & ab & a+b \end{array} \right|$ ની કિંમત કેટલી થાય?

$\Delta=\left|\begin{array}{ccc}2 & -3 & 5 \\ 6 & 0 & 4 \\ 1 & 5 & -7\end{array}\right|$ માટે ગુણધર્મ $2$ ચકાસો.

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