Răspuns :
[tex]\rm \log_32*log_43*log_54*....*log_{16}15= \\ \\ \frac{lg2}{lg3}*\frac{lg3}{lg4}*\frac{lg4}{lg5}+......+\frac{lg14}{lg15}*\frac{lg15}{lg16}=\frac{lg2}{lg16}=\frac{lg2}{lg2^4}=\frac{lg2}{4lg2}=\boxed{\frac{1}{4}}[/tex]