List the factors of each number. Compare the lists to find the greatest number common to both. This is the HCF. Draw factor trees close for each number. Write each number as a product of its prime ...

Ans. AP = 0.5 n (first term + last term) = 0.5 n [ 2a + (n-1) d ] Q7. What is the HCF (highest common factor)? Ans. The HCF (Highest Common Factor) of two or more numbers is the highest number ...