Math Problem Statement

find the n th term of the sequence 3,2,5/3,6/4, 7/5,.. and find its limit if exist

Solution

To find the nn-th term of the sequence, we will first observe the general pattern.

Given sequence: 3,2,53,64,75,3, 2, \frac{5}{3}, \frac{6}{4}, \frac{7}{5}, \ldots

The numerators of the terms are increasing by 1, starting from 3: 3,2,5,6,7,3, 2, 5, 6, 7, \ldots which suggests that the numerator follows the pattern 3+(n1)=2+n3 + (n - 1) = 2 + n.

The denominators follow the sequence: 1,1,3,4,5,1, 1, 3, 4, 5, \ldots which suggests that the denominator for the nn-th term is n+1n + 1.

Thus, the general form of the nn-th term ana_n is: an=2+nn+1a_n = \frac{2 + n}{n + 1}

Finding the limit of the sequence:

Now, we compute the limit of the sequence as nn \to \infty:

limnan=limn2+nn+1\lim_{n \to \infty} a_n = \lim_{n \to \infty} \frac{2 + n}{n + 1}

We can divide both the numerator and denominator by nn:

limnan=limn2n+11+1n\lim_{n \to \infty} a_n = \lim_{n \to \infty} \frac{\frac{2}{n} + 1}{1 + \frac{1}{n}}

As nn \to \infty, both 2n0\frac{2}{n} \to 0 and 1n0\frac{1}{n} \to 0. Therefore, we get:

limnan=0+11+0=1\lim_{n \to \infty} a_n = \frac{0 + 1}{1 + 0} = 1

So, the limit of the sequence is 1 as nn \to \infty.

Summary:

  • The nn-th term of the sequence is 2+nn+1\frac{2 + n}{n + 1}.
  • The limit of the sequence as nn \to \infty is 1.

Do you need further clarification on this?

Here are 5 related questions:

  1. Can you determine the general form of a sequence from its first few terms?
  2. How do you find the limit of more complex sequences?
  3. What is the difference between arithmetic and geometric sequences?
  4. How can you determine whether a sequence converges or diverges?
  5. How does L'Hopital's rule help in finding the limit of sequences?

Tip: When dealing with sequences, identifying the pattern in the numerators and denominators separately can often help to find the general term.

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Sequences
Limits
Algebra

Formulas

a_n = (2 + n) / (n + 1)
lim (n → ∞) a_n = 1

Theorems

Limit Theorem
Convergence of Sequences

Suitable Grade Level

Grades 9-12