x. 1/2, 1/6, 1/18, 1/54
Sol. t1 = 1/2
t2 = 1/2 × 1/3 = 1/6
t3 = 1/6 × 1/3 = 1/18
t4 = 1/18 × 1/3 = 1/54
t5 = 1/54 × 1/3 = 1/162
t6 = 1/162 × 1/3 = 1/486
t7 = 1/486 × 1/3 = 1/1458
t8 = 1/1458 × 1/3 = 1/4374
The next four terms of the sequence are 1/162 , 1/486, 1/1458, 1/4374
