(d) $\frac{\log_{3}{5.\log_{25}{27.\log_{49}7}}}{\log_{81}3}$ $= \frac{\frac{\log 5}{\log 3}.\frac{3}{2}.\frac{\log 3}{\log 5}.\frac{1}{2}}{\frac{1}{4}}$ $= 3$
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.