Given: A.P. = 11, 8, 5, 2…

Here a₁ = a = ;

d = a₂ – a₁ = – = -

If possible, take – as the n_th term of the given A.P.

a_n = a + (n – 1) d

⇒ - = + (n – 1) × (-)

⇒ - = – n +

⇒ – n = –

⇒ n= + =

Here n is not an integer.

∴ - is not a term of the given A.P.