यदि $\log (x-y) - \log 5 - \frac{1}{2} \log x - \frac{1}{2} \log y = 0$ है,तो $\frac{x}{y} + \frac{y}{x}$ का मान ज्ञात कीजिए।

  • A
    $25$
  • B
    $26$
  • C
    $27$
  • D
    $28$

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यदि $\log _{30} 3=a$ और $\log _{30} 5=b$ है,तो $\log _{30} 8$ का मान ज्ञात कीजिए।

यदि $\frac{\log x}{a^{2}+a b+b^{2}}=\frac{\log y}{b^{2}+b c+c^{2}}=\frac{\log z}{c^{2}+c a+a^{2}}$,तो $x^{a-b} \cdot y^{b-c} \cdot z^{c-a}=$

यदि $\log (2 a-3 b)=\log a-\log b$ है,तो $a=$

$\log _{5}\left(1+\frac{1}{5}\right)+\log _{5}\left(1+\frac{1}{6}\right)+\log _{5}\left(1+\frac{1}{7}\right)+\cdots+\log _{5} \left(1+\frac{1}{624}\right)$

$\log _{10} \tan 40^{\circ} \cdot \log _{10} \tan 41^{\circ} \cdots \log _{10} \tan 50^{\circ} = ?$

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