If $S$ is the sum to infinity of a $G.P.$, whose first term is $a$, then the sum of the first $n$ terms is
If $S$ is the sum to infinity of a $G.P.$, whose first term is $a$, then the sum of the first $n$ terms is
- A
$S{\left( {1 - \frac{a}{S}} \right)^n}$
- B
$S\left[ {1 - {{\left( {1 - \frac{a}{S}} \right)}^n}} \right]$
- C
$a\left[ {1 - {{\left( {1 - \frac{a}{S}} \right)}^n}} \right]$
- D
None of these
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