यदि $\frac{\sin A - \sin C}{\cos C - \cos A} = \cot B$ है,तो $A, B, C$ किसमें हैं?

  • A
    $A.P.$
  • B
    $G.P.$
  • C
    $H.P.$
  • D
    इनमें से कोई नहीं

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