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Explanation
a shaded circle in number line indicates that the number in the shaded point is also included in the interval. In the interval notation this limit is expressed using a square bracket.
A circle that is not shaded in a number line indicates that the number is not included in the interval. In interval notation a bracket is used to represent that point on the number line.
An arrow shows the extension to negative or positive infinity. The symbol is used to represent infinity and is always included in bracket.