Question
If $|r|<1$, the sum of the geometric series $\sum_{k=1}^{\infty} a r^{k-1}$ is _________.(a) $a(1-r)$(b) $(1-r)^a$(c) $a^{1-r}$(d) $\frac{a}{1-r}$
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The series is \(\sum_{k=1}^{\infty} a r^{k-1}\). Show more…
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