Question

which term of the A.P. 5,13,21,............is 181?

Answer 1

Here,
The first term of an A.P(a)=5
The common difference(d)=13-5=8
The n th term = 181

Total number of terms in an A.P= a + (n - 1)d
Here,
181 = 5 + (n-1)8
181 = 5 + 8n - 8
181 = 8n - 3
184 = 8n
n = 23
Hence,
The 23rd term of the A.P is 181

Answer 2

Mate,

You can get the answer easily for the question by applying the formula

An = a + (n - 1) d

The final answer we get is 23