Find LCM of 9/4, 21/10, 63/20.

Correct option is D

Given:

$$\frac{9}{4}, \frac{21}{10}, \frac{63}{20}$$ 

​Formula Used:

$$\text{LCM of fractions} = \frac{\text{LCM of numerators}}{\text{GCD of denominators}}$$ 

Solution:

$$\text{LCM}(9, 21, 63) = 63\\\text{GCD}(4, 10, 20) = 2\\\text{LCM of the fractions} = \frac{63}{2}\\$$​