(Q2).Find which of the following are not G.P.
(ii)1, 4, 9, 16, ……
Given: 1, 4, 9, 16, …..
a
1
= a =
a
2
=
; a
3
=
, a
4
=
a
2
a
1
=
1
=
;
a
3
a
2
=
;
a
4
a
3
=
, .....
i.e.,
a
2
a
1
≠
a
3
a
2
≠
a
4
a
3
≠ ..........
∴ The given numbers do not form a G.P.
Clear