To sketch: The interval on the number line.
The interval which is of the form is called as an open interval because none of its end points are included in the interval.
The open interval represents the real numbers that lies in between 3 and 6 both exclusive.
Thus, the numbers that satisfies the condition where w is the set of all real numbers in between 3 and 6.
Figure 1 is the number line representation of the interval (3, 6).
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