Mister Exam
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How to use it?
- Sum of series:
-
((-1)^(n+1))/(2^n)
- (-1)^n*x^n/(2*n+1)
- (x^n)/(n*(n+1))
- k*x+b
-
Identical expressions
- one / three ^(2x- one)
- 1 divide by 3 to the power of (2x minus 1)
- one divide by three to the power of (2x minus one)
- 1/3(2x-1)
- 1/32x-1
- 1/3^2x-1
- 1 divide by 3^(2x-1)
-
Similar expressions
- 1/3^(2x+1)
Sum of series 1/3^(2x-1)
The solution
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oo ___ \ ` \ 1 - 2*x / 3 /__, n = 1
$$\sum_{n=1}^{\infty} \left(\frac{1}{3}\right)^{2 x - 1}$$
Sum((1/3)^(2*x - 1), (n, 1, oo))
The radius of convergence of the power series
Given number:
$$\left(\frac{1}{3}\right)^{2 x - 1}$$
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
$$a_{n} = \left(\frac{1}{3}\right)^{2 x - 1}$$
and
$$x_{0} = 0$$
,
$$d = 0$$
,
$$c = 1$$
then
$$1 = \lim_{n \to \infty} 1$$
Let's take the limit
we find
$$\left(\frac{1}{3}\right)^{2 x - 1}$$
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
$$a_{n} = \left(\frac{1}{3}\right)^{2 x - 1}$$
and
$$x_{0} = 0$$
,
$$d = 0$$
,
$$c = 1$$
then
$$1 = \lim_{n \to \infty} 1$$
Let's take the limit
we find
True
False
Examples of finding the sum of a series
- The Sum of the Power Series
x^n/n
(x-1)^n
- Factorial
1/2^(n!)
n^2/n!
x^n/n!
k!/(n!*(n+k)!)
- Flint Hills Series
csc(n)^2/n^3
- Basel problem
1/n^2
1/n^4
1/n^6
- Harmonic series
1/n
- Grandi's series
(-1)^n
- Alternating series
(-1)^(n + 1)/n
(n + 2)*(-1)^(n - 1)
(3*n - 1)/(-5)^n
(-1)^(n - 1)*n/(6*n - 5)
- Newton–Mercator series
(-1)^(n + 1)/n*x^n
- Exam the series for convergence
(3*n - 1)/(-5)^n