Q. 7 C4.5( 2 Votes )

Which term of A.P. 3, 8, 13, 18, ... is 88?

Answer :

Here, a = 3, d = 8 – 3 = 5 and an = 88


To find : n


We have,


an = a + (n – 1)d


88 = 3 + (n – 1) × (5)


88 = 3 + 5n – 5


88 = –2 + 5n


88 + 2 = 5n


90 = 5n


n = 18


Therefore, the 18th term of the given AP is 88.


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