Find the HCF of 5/6, 3/7 and 11/21 = ?

Question: Find the HCF of 5/6, 3/7 and 11/21 = ?

Solution:
For the HCF of fractions, it has to be taken the HCF of numerators and LCM of denominators.

HCF of 5, 3, 11 = 1
LCM of 6, 7, 21 = 42

HCF of numerators/LCM of denominators = 1/42

Hence, the HCF of 5/6, 3/7 and 11/21 = 1/42