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a + a r + a r^{2} + . . . . . . . . . . . . . . . . . . + a r^{n - 1} = ক ত ?

\frac{a^{2} (1 - r^{n})}{1 - r}

\frac{a^{2} (1 - r^{n})}{1 - r^{2}}

\frac{a (1 - r^{n})}{1 - r^{3}}

\frac{a (1 - r^{n})}{1 - r}

\frac{a^{2} (1 - r^{n})}{1 - r^{4}}

ANS : 4

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