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Sum of series:
1/n*(n+1)
(n+1)/n
6/(3n-1)(3n+5)
(n-1)*5
Identical expressions
(n- one)* five
(n minus 1) multiply by 5
(n minus one) multiply by five
(n-1)5
n-15
Similar expressions
(-12/(9n-15)+4/(3n+1))
((-1)**(n-1))*((5**(2*n-1))/(2*n-1))
(n+1)*5
8/(16n^2+8n-15)
((-1)^(n-1))*(5^n+2)*x^n

Sum of series/ (n-1)*5

Sum of series (n-1)*5

The solution

You have entered [src]

  20            
 __             
 \ `            
  )    (n - 1)*5
 /_,            
n = 10

$$\sum_{n=10}^{20} 5 \left(n - 1\right)$$

Sum((n - 1)*5, (n, 10, 20))

The rate of convergence of the power series

The answer [src]

$$770$$

Numerical answer [src]

770.000000000000000000000000000

770.000000000000000000000000000

The graph

Sum of series (n-1)*5

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
```