X Y
--------- ----------
1 2 3 4 5 6 7 8
--------- ----------
XUY (has only 8 elements)
--------------------------
1 2 3 4 5 6 7 8
--------------------------
Now, try to draw and post the sets A and B, and then draw the union of A and B.A=1,2,3,4
B=3,4,5,6
U=1,2,3,4,5,6,7,8,9
U-------------------\
| |
| A--------\ |
| | 1 2 | |
| | | |
| B-+--------+-\ |
| | | 3 4 | | |
| | \--------/ | |
| | | |
| | 5 6 | |
| | | |
| \------------/ |
| 7 8 9 |
\-------------------/
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