(v) 2, 6, 12, 20, 30, ... (1 mark)
Sol. t1 = 0 + 2 = 2
t2 = 2 + 4 = 6
t3 = 6 + 6 = 12
t4 = 12 + 8 = 20
t5 = 20 + 10 = 30
t6 = 30 + 12 = 42
t7 = 42 + 14 = 56
t8 = 56 + 16 = 72
t9 = 72 + 18 = 90
∴ The next four terms of the sequence are 42, 56, 72 and 90.