Which of following sequences are in G.P.
`1, -5, 25, -125, …`

Answer

(i) 3 it is a G.P.
(ii) 10.99
(iii) `1/10` it is a G.P.
(iv) `1/2` it is G.P.
(v) `-5` is a G.P.
(vi) `t_(2)/t_(1) = t_(3)/t_(2) ne t_(4)/t_(3)` it is not a G.P.
(vii) `1/4` it is G.P.