$(1-4x)^{-4}$ के विस्तार में $13$ वाँ पद है

  • A
    ${}^{15}C_4 4^{12} x^{12}$
  • B
    $728 x^{12}$
  • C
    ${}^{15}C_3 4^{12} x^{12}$
  • D
    $1092 x^{12}$

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यदि $x=\frac{2}{5}+\frac{1 \cdot 3}{2 !}\left(\frac{2}{5}\right)^2+\frac{1 \cdot 3 \cdot 5}{3 !}\left(\frac{2}{5}\right)^3+\ldots$ है,तो $x+\frac{1}{x}=$

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