## Introduction

A sequence is a list of numbers or objects arranged in a specific order or pattern. In mathematics, sequences play a crucial role in various areas such as number theory, calculus, and statistics. Understanding the definition and properties of sequences is essential for solving mathematical problems and making predictions.

## Definition of Sequence

A sequence is a function whose domain is the set of natural numbers or a subset of the natural numbers. Each number in the sequence is called a term, and the position of a term in the sequence is called its index. The terms in a sequence are often denoted by {a_n}, where n is the index.

## Types of Sequences

- Arithmetic Sequence: A sequence in which each term is obtained by adding a constant value to the previous term. Example: 2, 4, 6, 8, 10.
- Geometric Sequence: A sequence in which each term is obtained by multiplying the previous term by a constant value. Example: 3, 6, 12, 24, 48.
- Fibonacci Sequence: A sequence in which each term is the sum of the two preceding terms. Example: 0, 1, 1, 2, 3, 5.

## Applications of Sequences

Sequences are used in various fields such as physics, biology, finance, and computer science. In physics, sequences are used to model the motion of objects and predict future events. In biology, sequences are used to analyze genetic code and study evolutionary relationships. In finance, sequences are used to analyze stock prices and predict market trends. In computer science, sequences are used in algorithms and data structures.

## Case Study: Stock Price Prediction

Investors use sequences to predict future stock prices based on historical data. By analyzing the trend of stock prices over time, investors can make informed decisions on buying or selling stocks. Machine learning algorithms are often used to analyze large datasets and predict stock prices with high accuracy.

## Statistics on Sequences

- According to a study by the American Mathematical Society, sequences are used in over 70% of mathematical research papers.
- A survey of finance professionals found that 90% of them use sequences to analyze market trends and make investment decisions.
- In a study on genetic sequencing, researchers found that sequences play a crucial role in understanding the structure of DNA and predicting genetic disorders.