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1. Let A, B, C and D be sets. Determine whether the following statements are true or false. Prove the statements which are true; note that Venn Diagrams are not proofs.
Give a counter example for each statement which is false.
(a) If A ∩ B = A ∩ C, then B = C.
(b) If A ⊕ B = A ⊕ C, then B = C.
(c) If A B and B ⊆ C, then A C.
(d) A \ (B U C) = (A \ B) U (A \ C).
2. Let A, B and C be sets. Prove that if A ⊆ B and C D, then AxC Bx D.
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An expensive fencing along the lots length costs $20 per fott and an inexpensive fencing along the two side widths costs only $8 per foot. the total cost of the fencing along the three sides comes to $3280. What is the area of the lot?
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