यदि $A = \begin{bmatrix} 1 & 0 & 0 \\ a & -1 & 0 \\ b & c & 1 \end{bmatrix}$ इस प्रकार है कि $A^2 = I$,तो

  • A
    $b = \frac{ac}{2}$
  • B
    $b = -\frac{ac}{2}$
  • C
    $b = \frac{a + c}{2}$
  • D
    $b = \sqrt{ac}$

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