Question

what are the rules of writing interval of sets?​

Answer 1

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Intervals are written with rectangular brackets or parentheses, and two numbers delimited with a comma. The two numbers are called the endpoints of the interval. The number on the left denotes the least element or lower bound. The number on the right denotes the greatest element or upper bound.

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Answer 2

Answer:

[ ] a square bracket when we want to include the end value, or

( ) a round bracket when we don't