(Q13).Find the 12
th
term of a G.P. whose 8 term is 192 and the common ratio is 2.
Given a G.P. such that a
8
=
and r =
a
n
= a.r
n-1
a
8
= a.(
)
8-1
= 192
a .
7
= 192 ⇒ a =
7
=
=
=
∴ a
12
= a.r
11
=
× (
)
11
=
×
10
=
×
=
.
Clear