1, 4, 7, 10, .... (1 mark)

(iii) 1, 4, 7, 10, .... (1 mark)

Sol. t₁ = 1, t2 = 4, t3 = 7, t4 = 10

t₂ – t₁ = 4 – 1 = 3

t₃ – t₂ = 7 – 4 = 3

t₄ – t₃ = 10 – 7 = 3

Here, The difference between ANY two consecutive terms 3 which is constant.

∴ The sequence is an A.P.