Question

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

Answer 1

Answer:

Consider the A.P., 5,13,21,...

The first term, a=5

The common difference, d=13−5=8

The n th

term is 181

The n th

term is given by a+(n−1)d

⇒181=5+(n−1)8

⇒181=5+8n−8

⇒181=8n−3

⇒184=8n

⇒n=23

Hence, the 23 rd

term of the A.P is 181

Answer 2

Answer:

23rd term

Step-by-step explanation:

A.P = 5, 13, 21, ..........

a = 5

d = 13 - 5 = 8

l = 181

n = ?

n = [ ( l - a ) / d ] + 1

  = [ ( 181 - 5 ) / 8 ] + 1

  = [ 176 / 8 ] + 1

  = 22 + 1

n = 23

23rd term of A.P of 5,13, 21, ........... is 181.