Question 7

# The HCF of 42, 63 and 105 is:

Solution

42 = $$2 \times 3 \times 7$$

63 = $$3 \times 3 \times 7$$

105 =  $$3 \times 5 \times 7$$

Taking the common factors, the HCF would be 21.

So , the answer would be option d)21.