Question

Given two sets A and B, the intersection of these sets, denoted A ∩ B, is...

  • Given two sets A and B, the intersection of these sets, denoted AB, is the set containing the elements that are in both A and B. That is, AB = {x : xA and xB}.
  • Two sets A and B are disjoint if they have no elements in common. That is, if AB = ∅.
  • Given two sets A and B, the union of these sets, denoted AB, is the set containing the elements that are either in A or in B (or in both). That is, AB = {x : xA or xB}.
  • Given two sets A and B, the relative complement or difference of these sets, denoted BA, is the set of elements that are in B but not in A. That is, BA = {x : xB and x /A}.

  • Given a universal set U and a set A, the complement of the set A with respect to the set U, denoted as AC or A, is

the set UA. That is, A = {xU : x /A}.

  • Given two sets A and B, the symmetric difference of these sets, denoted AB, is the set of elements that are in A or B but not both. That is, AB = (AB) − (AB).
  1. Let A = {a,b,c,d,e,f}, B = {a,c,e,f,g,h,i}, C = {b,c,d,f,g,h} and U = {a,b,c,d,e,f,g,h,i,j}. Express each of the following in roster notation.

              (a) AB                                                      (b) AB                                                      (c) AB

              (d) AC                                                       (e) CA                                                       (f) C

               (g) A − (BC)                                            (h) A ∪ (BC)                                (i) (AB) ∩ (AC)

  1. Suppose U = {1,2,3,4,5,6} and B = {2,3,4}.
    1. What can you say about the set A if AB = {1,2,3,4,5}?
    2. What can you say about the set A if AB = {2,3}?
    3. What can you say about the set A if AB = {1,2,4,5}?
  2. What can you day about the sets A and B if AB = ∅?
  3. Draw a general Venn diagram representing each of the following:

  1. AB (b) AB

               (c) (AB) − C                                                                                (d) A ∪ (BC)

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