A= {a,c,w,z} B= {a} Note that B c A (c=subset=/n= intersection/ u= union). Find a subset C of A such that B u C=A and B n C=0 (empty set).
1. C=_____________________________________
2. Let D = {c, w}. Note that D c A. Find a subset of E of A such that D u E= A and D n E={0}.
E=_______________________________
3. How many distinct pairs of disjoint non empty subsets of A are there, the union of which is all of A?_____________________________
Any help will be great.

Question

A= {a,c,w,z} B= {a} Note that B c A (c=subset=/n= intersection/ u= union).  Find a subset C of A such that B u C=A and B n C=0 (empty set).   
1. C=_____________________________________
2.  Let D = {c, w}.  Note that D c A.  Find a subset of E of A such that D u E= A and D n E={0}.
E=_______________________________
3. How many distinct pairs of disjoint non empty subsets of A are there, the union of which is all of A?_____________________________
Any help will be great.