Let $0
To prove divergence of a series.
4
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calculus
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0What does "diverges as r tends to 1 mean "? – 2012-12-16
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0@Amr As r tends to 1, the sum tends to infinity. – 2012-12-16
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3If $N$ is fixed, what is $\lim\limits_{r\rightarrow1^-}\sum_{j=1}^N r^{j!}$? – 2012-12-16