Posted by Sabrina on Saturday, August 8, 2009 at 12:23pm.
Suppose C is a subset of D and D is a Subset of C.
If n(c)=5,find n(D)
what other relationship exists between C and D

Elementary Math for Educator  MathMate, Saturday, August 8, 2009 at 12:40pm
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.

Elementary Math for Educator  MathMate, Sunday, August 9, 2009 at 5:27pm
Correction
If C âŠ‚ D ∩ D âŠ‚ C
...
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