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 ⊂ D **∩** D ⊂ C

...

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