(4)
In a GP if T6 = 32 and r = 2 find a Solution:
(5)
Use Tn = arn-1
The 10th term of a GP is 8 times of its 13th term if the first term is 3, then find the sum of infinite terms. (M - 09) Solution:
T10 = 8 x T13 T10 T13
a=3
=8
r = .................
S∞ = ................................. = .................................
................. = 8 = .................................. ............................. = ................................... r = .......................... = ................................... (6)
Find the sum of the series 2 + 4 + 8 + ............. + 256 Solution:
a = ..............
Tn = arn-1
(J - 09)
Sn = a
r = ...................
= ..................
=
Tn = .................
= .................
=
n = .................
=
n=?
= 56
rn - 1 r-1