The nth term of an AP is (3n + 5). Find its common difference.
nth term of an AP = an = 3n + 5
Common difference (= d) of an AP is the difference between a term and its preceding term.
∴ d = an - an - 1
= (3n + 5) - (3(n - 1) + 5)
= 3n + 5 - 3n + 3 - 5
= 3
∴ Common difference = 3