If $\frac{1}{\log_3 \pi} + \frac{1}{\log_4 \pi} > x$,then $x =$ ?

If ${\log _{10}}3 = 0.477$,then the number of digits in ${3^{40}}$ is

If $\log_{0.3}(x - 1) < \log_{0.09}(x - 1)$,then $x \ne 1$ lies in

If ${\log _{10}}x = y$,then the value of ${\log _{1000}}{x^2}$ is

If $a, b, c$ are three distinct positive numbers different from $1$ such that $[(\log_b a)(\log_c a) - \log_a a] + [(\log_a b)(\log_c b) - \log_b b] + [(\log_a c)(\log_b c) - \log_c c] = 0$,then $abc =$

If ${a^x} = b$,${b^y} = c$,and ${c^z} = a$,then the value of $xyz$ is: