Question

1, 7, 13, 19 ...... find 18^th term of this A.P.

Answer 1

The given A.P. is 1, 7, 13, 19, ......

Here, a = 1, d = 7 – 1 = 6

Since t_n = a + (n – 1)d,

t₁₈ = 1 + (18 – 1)(6)

= 1 + 17(6)

= 1 + 102

= 103

∴ 18^th term of the given A.P. is 103.