Tuesday
October 21, 2014

Homework Help: math

Posted by sara on Tuesday, April 10, 2007 at 4:22pm.

If A is a finite set and B is a proper subset of A, prove that |B| < |A|.
Hint: B is finite. What is the union of the disjoint sets B and A - B?

Note: |A| = size of A

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