Q.2. What is the HCF of two consecutive
(a) numbers?
(b) even numbers?
(c) odd numbers?

(a) The common factor of two consecutive numbers is always 1. Hence, their HCF = 1.
(b) The common factors of two consecutive even numbers are 1 and 2. Hence, their HCF = 1 x 2 = 2.
(c) The common factor of two consecutive odd numbers is 1. Hence, their HCF = 1.