જો $\log_2 x + \log_x 2 = \frac{10}{3} = \log_2 y + \log_y 2$ અને $x \neq y$ હોય,તો $x + y = $

  • A
    $2$
  • B
    $65/8$
  • C
    $37/6$
  • D
    આમાંથી કોઈ નહીં

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જો $a, b, c \neq 0$ અને ગણ $\{1, 2, 3, \ldots, 9\}$ માં હોય,તો $\log _{10}\left(\frac{a+10 b+10^2 c}{10^{-4} a+10^{-3} b+10^{-2} c}\right)$ ની કિંમત શોધો.

જો $\log _{7} 2 = \lambda$ હોય, તો $\log _{49} (28)$ ની કિંમત શોધો.

$7 \log \left( \frac{16}{15} \right) + 5 \log \left( \frac{25}{24} \right) + 3 \log \left( \frac{81}{80} \right)$ ની કિંમત શોધો.

જો $n = (2020)!$ હોય,તો $\frac{1}{\log _{2} n} + \frac{1}{\log _{3} n} + \frac{1}{\log _{4} n} + \ldots + \frac{1}{\log _{2020} n}$ ની કિંમત કેટલી થાય?

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