AIR MATH

Math Question

Which geometric series converges?
\( \frac{1}{81}+\frac{1}{27}+\frac{1}{9}+\frac{1}{3}+\ldots \)
\( 1+\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\ldots \)
\( \sum_{n=1}^{\infty} 7(-4)^{n-1} \)
\( \sum_{n=1}^{\infty} \frac{1}{5}(2)^{n-1} \)

Solution

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