If $s$ is the sum of an infinite $G.P.$ and $a$ is the first term,then the common ratio $r$ is given by:
- A$\frac{a - s}{s}$
- B$\frac{s - a}{s}$
- C$\frac{a}{1 - s}$
- D$\frac{s - a}{a}$
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