Please help me prove this. Use an element argument to prove those. Assume that all sets are subsets of a universal set U. Please write down the definition in the step too so I can understand it....

Please help me prove this. Use an element argument to prove those. Assume that all sets are subsets of a universal set U. Please write down the definition in the step too so I can understand it. Thanks.

Extracted text: 11. For all sets A, B, and C, AN (B-C) C (A N B)– (A N C).