यदि $\log _3 x+\log _3 y=2+\log _3 2$ और $\log _3(x+y)=2$ है, तो

  • A
    $x=1, y=8$
  • B
    $x=8, y=1$
  • C
    $x=3, y=6$
  • D
    $x=9, y=3$

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$\log _{\left(x+\frac{7}{2}\right)}\left(\frac{x-7}{2 x-3}\right)^2 \geq 0$ के पूर्णांक हलों $x$ की संख्या है

यदि $n = (1999)!$ है,तो $\sum\limits_{x = 1}^{1999} {{\log }_n x}$ का मान ज्ञात कीजिए।

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