S_{n}=\left\{\begin{array}{ll}{\text { na }} & {\text { if } \quad x=1 – InterviewSolution

1.	S_{n}=\left\{\begin{array}{ll}{\text { na }} & {\text { if } \quad x=1} \\ {\frac{a\left(1-x^{n}\right)}{1-r}} & {\text { if } \quad r \neq 1}\end{array}\right.
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