Question

Which term of term of the AP 3,8,13,18,….. is 88?

Answer 1

In the given AP, first term, a = 3 and common difference, a = (8-3)= 5.

Let’s its n^th  term be 88

Then, T_n = 88

⇒ a + (n-1) d = 88 

⇒ 3+ (n-1) × 5 = 88

⇒ 5n - 2 = 88

⇒ 5n = 90

⇒ n = 18

Hence, the 18^th  term of the given AP is 88.