यदि $4x + 5y = 83$ और $\frac{3x}{2y} = \frac{21}{22}$ है,तो $y - x = ?$ ज्ञात कीजिए।

  • A
    $3$
  • B
    $4$
  • C
    $7$
  • D
    $11$

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दिए गए विकल्पों में से $(a^{2}-b^{2})^{3}+(b^{2}-c^{2})^{3}+(c^{2}-a^{2})^{3}$ का एक गुणनखंड कौन सा है?

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