5. If p and q are positive integers, then {pn:neN} n {qn:n €N} ‡ Ø. 6. Suppose A, B and C are sets. Prove that if AB, then A-C≤B-C. 7. Suppose A, B and C are sets. If B≤C, then Ax B≤AXC. 8. If A,B and C are sets, then Au(BnC)=(AUB) n(AUC). 9. If A, B and C are sets, then An(BUC)=(AnB)u(ANC). 10. If A and B are sets in a universal set U, then AnB=AUB. TC D 7-7

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