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Let U = {a, b, c, d, e, f, g, h} and let A, B be subsets of U.

Suppose further that A'n B = {a,g, h}, A - B = {b, f}, and
(AUB) = {c,d}
a) A = {a, g, h}, B = {b, f}
b) A = {a, b, f}, B = {c, d}
c) A = {a, b, f}, B = {a, g, h}
d) A = {c, d}, B = {a, g, h}

User Anbnyc
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1 Answer

2 votes

Final answer:

Considering the definitions of set complement, difference, union, and intersection, only option (c) A = {a, b, f} and B = {a, g, h} correctly satisfies the given set relationships, as it accounts for all provided set operations.

Step-by-step explanation:

The question involves the concepts of set theory specifically dealing with operations like complement, difference, union, and intersection of sets. Given the universal set U and subsets A and B, we have information about A' intersect B (A' n B), the difference of A and B (A - B), and the complement of the union of A and B ((A U B)'). To determine which option correctly represents sets A and B, we need to apply the definitions of these operations. Here's how we analyze the given information:

  • A' n B = {a, g, h} suggests that these elements are not in A but are in B.
  • A - B = {b, f} indicates these elements are in A but not in B.
  • (A U B)' = {c, d} means these elements are in neither A nor B.

Considering the options provided:

  • Option (a) is incorrect because if A = {a, g, h}, A' would not contain a, g, and h, thus A' n B cannot be {a,g,h}.
  • Option (b) is incorrect because A = {a, b, f} would mean that A' does not contain a, b, or f, which contradicts A' n B = {a,g,h}.
  • Option (c) is correct because A = {a, b, f} does not include g or h (present in A' n B), and B does not contain b or f (present in A - B). There is also no conflict with (A U B)' = {c,d}
  • Option (d) is incorrect because A cannot be {c, d} as (A U B)' indicates c and d are in neither A nor B.

Therefore, the correct answer is option (c), where A = {a, b, f} and B = {a, g, h}.

User Rubasace
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