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OpenStudy (anonymous):
find the radius of convergence....
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OpenStudy (anonymous):
\[\sum_{n=1}^{\infty} (2n)!(x^n)/(n!)^2\]
OpenStudy (amistre64):
find the ratio limit of (n+1)/n: L(n) then solve for: L(n) |x| < 1 |x| < 1/L(n)
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