Question

If the replacement set is the set of natural numbers, solve:  x + 1 ≤ 7

Answer 1

x + 1 ≤ 7

⇒ x + 1 – 1 ≤ 7 – 1 (Subtracting 1)

⇒ x ≤ 6

Required answer = {1, 2, 3, 4, 5, 6}