(Q20).Write three terms of the G.P. when the first term ‘a’ and the common ratio ‘r’ are given.
(iii) a = 81 ; r = –
1
3
The terms of a G.P are:
a, ar, ar
2
, ar
3
, ……..
⇒ 81, 81 ×
-1
, 81 × (
1
)
2
.......
⇒ 81, -
,
,
Clear