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Question
Which term of term of the AP 3,8,13,18,….. is 88?
Solution
In the given AP, first term, a = 3 and common difference, a = (8-3)= 5.
Let’s its nth term be 88
Then, Tn = 88
⇒ a + (n-1) d = 88
⇒ 3+ (n-1) × 5 = 88
⇒ 5n - 2 = 88
⇒ 5n = 90
⇒ n = 18
Hence, the 18th term of the given AP is 88.
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