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Sum of series/ 3/n

Sum of series 3/n

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n = 5

\sum_{n=5}^{\infty} \frac{3}{n}

Sum(3/n, (n, 5, oo))

The radius of convergence of the power series

Given number:

\frac{3}{n}

It is a series of species

a_{n} \left(c x - x_{0}\right)^{d n}

- power series.
The radius of convergence of a power series can be calculated by the formula:

R^{d} = \frac{x_{0} + \lim_{n \to \infty} \left|{\frac{a_{n}}{a_{n + 1}}}\right|}{c}

In this case

a_{n} = \frac{3}{n}

and

x_{0} = 0

d = 0

c = 1

then

1 = \lim_{n \to \infty}\left(\frac{3 \left(\frac{n}{3} + \frac{1}{3}\right)}{n}\right)

True

False

The rate of convergence of the power series

The answer [src]

oo

\infty

oo

Numerical answer

The series diverges

The graph