यदि $\frac{6 x^3+7 x^2+6 x-3}{(x-1)(x+3)\left(x^2+1\right)}=\frac{A}{x-1}+\frac{B}{x+3}+\frac{C x+D}{x^2+1}$ और $n=A+B+C+D$ तथा ${ }^{50} C_n={ }^{50} C_r$ है,तो $r$ का मान ज्ञात कीजिए।

  • A
    $40$
  • B
    $43$
  • C
    $35$
  • D
    $42$

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