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

  • A
    $3(1-a-b)$
  • B
    $a-b+1$
  • C
    $1-a-b$
  • D
    $3(a-b+1)$

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यदि $\log _{10} 50+\log _{10} 20=x$ है,तो $x$ का मान क्या होगा?

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यदि $\frac{\log x}{2} = \frac{\log y}{3} = \frac{\log z}{5}$ है,तो $x$ के पदों में $yz$ का मान क्या होगा?

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

$2 \log _{10} 5 + \log _{10} 8 - \frac{1}{2} \log _{10} 4 = ?$

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