a = 6, d = 6

(vi) a = 6, d = 6 (1 mark)

Sol. a = 6, d = 6

Here, t1 = a = 6

t2 = t1 + d = 6 + 6 = 12

t3 = t2 + d = 12 + 6 = 18

t4 = t3 + d = 18 + 6 = 24

t5 = t4 + d = 24 + 6 = 30

∴   The first five terms of A.P. are 6, 12, 18, 24 and 30.