# What does it mean if a series is telescoping?

## What does it mean if a series is telescoping?

Telescoping series is a series where all terms cancel out except for the first and last one. This makes such series easy to analyze.

Is telescoping series convergent?

If this series of partial sums s n s_n sn​ converges as n → ∞ n\to\infty n→∞ (if we get a real-number value for s), then we can say that the series of partial sums converges, which allows us to conclude that the telescoping series a n a_n an​ also converges.

### How do you tell if a series is a telescoping series?

Consider the following series:

1. To see that this is a telescoping series, you have to use the partial fractions technique to rewrite.
2. All these terms now collapse, or telescope.
3. and thus the sum converges to 1 – 0, or 1.
4. Here’s the telescoping series rule: A telescoping series of the above form converges if.

Can a telescoping series diverge?

because of cancellation of adjacent terms. So, the sum of the series, which is the limit of the partial sums, is 1. and any infinite sum with a constant term diverges.

#### How to find the sum of a telescoping series?

Telescoping series is a series where all terms cancel out except for the first and last one. This makes such series easy to analyze. In this video, we use partial fraction decomposition to find sum of telescoping series. Created by Sal Khan. This is the currently selected item.

How to convert series terms to summation notation?

The terms in the numerator are exponential powers of 5: 5^1 = 5, 5^2 = 25, 5^3 = 125 ; the terms in the denominator are multiples of 3: 3*1 = 3, 3*2 = 6, 3*3 = 9. Comment on Daryl’s post “The terms in the numerator are exponential powers …”

## How is the telescoping series related to convergence?

One approach is to use the definition of convergence, which requires an expression for the partial sum, . We see that by using partial fractions. Expanding the sum yields Rearranging the brackets, we see that the terms in the infinite sum cancel in pairs, leaving only the first and lasts terms.

What does the Sigma stand for in telescoping?

Direct link to ArDeeJ’s post “It’s a capital sigma, the greek letter Σ. It stand…” It’s a capital sigma, the greek letter Σ. It stands for summation. The “n = 2” below it tells that the variable n starts with the value 2, and the ∞ above tells that it runs to infinity.