If a is the first term 'a' and 'r' is common ratio,
then the sum of n terms of G.P is given by
a(r” – 1
Sn
a(1-2)
ifr >1=
if i < n ;
(n-1)
(1-r)
na if r= 1
If 5th term of a G.P is 32 and common ratio is
2, then the sum of 15 terms is
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