The LCM of 2/3 ,3/5 ,4/7, 913 is = ?

Answer: Option A

$$\begin{array}{rl}& \text{Required LCM}\\ & =\frac{\text{LCM of 2,3,4,9}}{\text{HCF of 3,5,7,13}}\\ & =\frac{36}{1}\\ & =36\end{array}$$