Posted by Sabrina on Saturday, August 8, 2009 at 12:23pm.
If C ⊂ D ∪ D ⊂ C
it implies C = D.
Thus if the cardinality of C is 5, the cardinality of D is also 5.
The other relationship is, as mentioned above, C = D.
Correction
If C ⊂ D ∩ D ⊂ C
...
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