Math CentralQuandaries & Queries


Question from Tracy, a student:

Suppose C is the subset of D and D is the subset of C.

If n(c)=5, find n(D)

What other relationship exists between sets C and D?


If C is a subset of D and D is a subset of C then it seems to me that C and D are equal. How would you prove that C and D are equal?


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