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How to Write Interval Notation: A Beginner’s Guide

Expressing Intervals Using Parentheses, Brackets, and Infinity Symbols When writing interval notation, it’s important to use the correct symbols to represent the endpoints of the interval. The three main symbols used in interval notation are parentheses, brackets, and infinity symbols. Parentheses are used to represent an endpoint that is not included in the interval. For example, the interval (1, 5)…