$7 \log \frac{16}{15} + 5 \log \frac{25}{24} + 3 \log \frac{81}{80} =$

  • A
    $\log 2$
  • B
    $\log 3$
  • C
    $\log 5$
  • D
    આમાંથી કોઈ નહીં

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જો $y = \frac{1}{a^{1-\log _{a} x}}$,$z = \frac{1}{a^{1-\log _{a} y}}$ અને $x = a^{k}$ હોય,તો $k =$

જો $\frac{\log x}{b-c} = \frac{\log y}{c-a} = \frac{\log z}{a-b}$ હોય,તો $xyz = x^a \cdot y^b \cdot z^c = x^{b+c} \cdot y^{c+a} \cdot z^{a+b} = $

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જો $\log _{e} 2 \cdot \log _{b} 625 = \log _{10} 16 \cdot \log _{e} 10$ હોય,તો $b =$

જો $\log _{10} 7 = a$ હોય,તો $\log _{10} \left( \frac{1}{70} \right)$ ની કિંમત કેટલી થાય?

જો $\frac{\log x}{a^{2}+a b+b^{2}}=\frac{\log y}{b^{2}+b c+c^{2}}=\frac{\log z}{c^{2}+c a+a^{2}}$ હોય,તો $x^{a-b} \cdot y^{b-c} \cdot z^{c-a}=$

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