# How do you find the partial sum of a telescoping series?

## How do you find the partial sum of a telescoping series?

Canceling everything but the first half of the first term and the second half of the last term gives an expression for the series of partial sums. To find the sum of the telescoping series, we’ll take the limit as n → ∞ n\to\infty n→∞ of the series or partial sums s n s_n sn​. The sum of the series is 1.

### What is sum partial fractions?

In algebra, the partial fraction decomposition or partial fraction expansion of a rational fraction (that is, a fraction such that the numerator and the denominator are both polynomials) is an operation that consists of expressing the fraction as a sum of a polynomial (possibly zero) and one or several fractions with a …

#### Why are telescoping series called telescoping?

Notice that every term except the first and last term canceled out. This is the origin of the name telescoping series. This also means that we can determine the convergence of this series by taking the limit of the partial sums.

How do you write a series as a telescoping series?

A telescoping series is a series where each term u k u_k uk can be written as u k = t k − t k + 1 u_k = t_{k} – t_{k+1} uk=tk−tk+1 for some series t k t_{k} tk.

Why is it called a telescoping sum?

## What is telescoping in math?

In mathematics, a telescoping series is a series whose general term can be written as , i.e. the difference of two consecutive terms of a sequence .

### Is a telescoping series convergent or divergent?

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

#### What do you mean by telescoping sum?

A sum in which subsequent terms cancel each other, leaving only initial and final terms.

What is the limit of a telescoping series?

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.

What is telescoping series in Algebra?

A telescoping seriesis a series where each term uku_k uk​can be written as uk=tk−tk+1u_k = t_{k} – t_{k+1} uk​=tk​−tk+1​for some series tkt_{k} tk​. This is a challenging sub-section of algebra that requires the solver to look for patterns in a series of fractions and use lots of logical thinking.

## What is the first part of the partial fraction decomposition?

Direct link to Stefen’s post “The first part, partial f…” The first part, partial fraction decomposition is a typical way to handle this type of integrand. Actually usually you have a quadratic expression that you try to factor to get the integrand in this form in order to apply PFD).

### What is the last fraction of 99 that is canceled out?

Like a telescope, it all can be collapsed and the last fraction simplifies to 100−99\\sqrt{100} – \\sqrt{99} 100​−99​. Since it’s the 99\\sqrt{99} 99​that will be canceled out, the given expression is equal to

#### How do you find the first term of a fraction?

Multiply both the numerator and denominator of each fraction by the conjugate of the denominator. Then, for example, the first term simplifies to 11+2⋅2−12−1=2−1.\\dfrac{1}{\\sqrt{1} + \\sqrt{2}} \\cdot \\dfrac{\\sqrt{2} – \\sqrt{1}}{\\sqrt{2} – \\sqrt{1}} = \\sqrt{2} – \\sqrt{1}.