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Advanced mathematics, basic problems. How to calculate convergence and divergence judgment?
Use ratio convergence method (D 'Alembert discriminant method).

Let ∑(n= 1 to infinity) |U(n+ 1)/Un|=ρ

Is a series of positive terms, each of which is a real number or a complex number other than 0, if

When rho

When ρ >; Series divergence at 1

When ρ= 1, the series may converge or diverge.

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