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Verbal

4. When describing sets of numbers using interval notation, when do you use a parenthesis and when do you use a bracket?

User Dakshika
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Explanation:

A parenthesis is used when the number next to it is NOT part of the solution set

like : all numbers up to but not including 3 .

Parens are always next to infinity when it is part of the solution set .

A bracket is used when the number next to it is included in the solution set.

User Gcso
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