What is an arithmetic sequence

The video tutorial explains what an arithmetic sequence is, highlighting that it is a set of numbers with a constant difference between consecutive terms. It can be finite or infinite. Examples such as 1, 2, 3, 4, 5 and 5, 10, 15, 20, 25 are provided to illustrate the concept. The tutorial defines the common difference, denoted as D, and shows how to verify if a sequence is arithmetic by checking if the difference between terms is consistent. The video concludes with a demonstration of proving a sequence is arithmetic using specific examples.

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