a = 5, d = 2

(iv) a = 5, d = 2 (1 mark)

Sol. a = 5, d = 2

Here, t1 = a = 5

t2 = t1 + d = 5 + 2 = 7

t3 = t2 + d = 7 + 2 = 9

t4 = t3 + d = 9 + 2 = 11

t5 = t4 + d = 11 + 2 = 13

∴   The first five terms of the A.P. are 5, 7, 9, 11 and 13.