Posted by Joey on Thursday, September 29, 2011 at 11:33pm.
This is a question that deals specifically with WebWork.
Here is the question:
Write the set of points from 2 to 4 but excluding 1 and 4 as a union of intervals
my solution to this would be: [2,4]U(1,4)
my reasoning:
The first set includes 2 and goes up to and includes 4, the second includes everything greater than 1 and goes to everything less than 4. This way, the integer 2 is still included. BUT, this is wrong.

Math 111  Steve, Friday, September 30, 2011 at 11:45am
If you had all the points, you'd have [2,4]
But, you have to exclude 4, leaving [2,4)
Now, inside this interval, you exclude 1, so you have to break it up into two intervals:
[2,1)U(1,4)

Math 103  Linda, Wednesday, September 18, 2013 at 5:11pm
Write the set of points from 5 to 1 but excluding 4 and 1 as a union of intervals

Math 111  Anonymous, Tuesday, September 30, 2014 at 5:39pm
(5,1)U(4,1)
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