Given: A.P: 7, 13, 19, ……….

Here a₁ = a = ; d = a₂ – a₁ = – =

Let be the n^th term of the given A.P.

Then, a_n = a + (n – 1) d

= + (n- 1)

⇒ = + n –

⇒ = n +

⇒ n = – =

∴ terms are there.