Math Problem Statement

which one is correct?

Use a Venn diagram to decide if the equation (A' U B)' = A' ∩ B is true or false.

Solution

We are tasked with determining if the given equation, (AB)(A' \cup B)', is equivalent to ABA' \cap B, using the Venn diagram.

  1. Expression 1: (AB)(A' \cup B)'

    • AA' refers to the complement of set AA, which is everything outside of set AA.
    • ABA' \cup B means the union of the complement of AA and set BB, which covers everything that is either outside of AA or inside BB.
    • Taking the complement of this, (AB)(A' \cup B)', means we take everything outside this union, i.e., the region that is inside AA but not in BB.
  2. Expression 2: ABA' \cap B

    • This refers to the intersection of the complement of AA and set BB, which would cover the region that is outside of set AA but inside BB.

Analysis Using the Venn Diagram:

  • (AB)(A' \cup B)' refers to the region inside AA that does not overlap with BB (i.e., only the leftmost part of AA).
  • ABA' \cap B refers to the part of BB that is outside of AA (i.e., only the rightmost part of BB).

Since these two expressions represent different regions of the Venn diagram, the two are not equal.

Conclusion:

The correct answer is False.

Would you like further details or clarifications on this? Here are some related questions:

  1. What are De Morgan's laws, and how do they relate to set theory?
  2. How do you apply Venn diagrams to prove set identities?
  3. Can you explain how to compute the complement of a set in a Venn diagram?
  4. What is the difference between union and intersection in set theory?
  5. How can you simplify complex set expressions using Venn diagrams?

Tip: Always visualize set operations using a Venn diagram for clarity, especially with complements and unions.

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Math Problem Analysis

Mathematical Concepts

Set Theory
Union and Intersection
Complement

Formulas

De Morgan's Laws

Theorems

De Morgan's Theorem

Suitable Grade Level

Grades 9-12