Exercise: Given P = {1, 2, 3),
Q = {2,3,4},
R = {3, 4, 5), and
S = {4, 5, 6} find:
1. PUR
2. QUR
3. QUS
4. PUQUR
5. PUQUS
6. QURUS
7. PnQ
8. PnR
9. QnR
10. PnS
