Answer :
Nth term of GP is Tn = arn - 1
⇒ 
…(1)
Nth term of GP is Tn = arn - 1
⇒ 
…(2)
Divide (1) by (2)
⇒ 
⇒ 
⇒ 
Substituting in 1 we get
a = 1
Sum of GP for n terms = 
a = 1, r = 
, n = n.
⇒ 
⇒ 
⇒ 
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