Question

solve both 4 and 5..
plz
plz​

Answer 1

$\log_35\cdot \log_{25}27=\log_35\cdot \dfrac{\log_327}{\log_325}=\log_35\cdot \dfrac{3}{2\log_35}=\dfrac{3}{2}$

$\log_4(\log_{\sqrt2}(\log_381))=\log_4(\log_{\sqrt2}4)=\log_44=1$