B={-17>x>19} What does this mean?Here no. starts from -16 or -17 and ends to 18 or 19?
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It means ...the number may any one between -17 and 19.
You should exclude -17.
Start from -16 and end at 18.
Exclude 19 also. U should include -17 and 19 only if there is greater than or equal to and less than or equal to symbols.
Draw a number line. U will understand better.
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