Western Governors University D 421
D421 exam
| Full
Questions,
Correct
Answers, and
Worked
Solutions | 2026
Update | 100%
Correct.
C
Practice questions for this set
, Terms in this set (66)
Cardinality of a set The number of elements in a finite set
N The set of all natural numbers. All integers greater
than or equal to 0.
Z The set of all integers.
Q The set of rational numbers
R The set of real numbers
A proper subset A subset that does not contain every element in
another set.
Power set The set of all subsets from a set. The power set of A is
denoted as P(A)
Difference between two sets The set of elements that are in the first set, but
not in the second. A-B is the set of elements in A
that are not also in B
Symmetric difference between two The elements in two sets that are only in one or the other
sets sets.
Complement of a set The elements in the domain that are not in the set.
Idempotent laws A ∪A =
AA∩A
=A
Associative laws A ∪ (B ∪ C) = (A ∪ B) ∪
C A ∩ (B ∩ C) = (A ∩ B) ∩
C
Commutative laws A ∪B = B ∪
AA∩B=B
∩A
Distributive laws A ∪ (B ∩ C) = (A ∪ B) ∩ (A ∪ C)
A ∩ (B ∪ C) = (A ∩ B) ∪ (A ∩ C)
Identity laws A∪∅ = A
A∩U = A
Domination laws A∪U=U
A∩∅=∅
Absorption laws A∪(A∩B)= A
A∩(A∪B)= A
Cartesian product The combination of all rows in the first table and all
rows in the second table denoted as A X B
D421 exam
| Full
Questions,
Correct
Answers, and
Worked
Solutions | 2026
Update | 100%
Correct.
C
Practice questions for this set
, Terms in this set (66)
Cardinality of a set The number of elements in a finite set
N The set of all natural numbers. All integers greater
than or equal to 0.
Z The set of all integers.
Q The set of rational numbers
R The set of real numbers
A proper subset A subset that does not contain every element in
another set.
Power set The set of all subsets from a set. The power set of A is
denoted as P(A)
Difference between two sets The set of elements that are in the first set, but
not in the second. A-B is the set of elements in A
that are not also in B
Symmetric difference between two The elements in two sets that are only in one or the other
sets sets.
Complement of a set The elements in the domain that are not in the set.
Idempotent laws A ∪A =
AA∩A
=A
Associative laws A ∪ (B ∪ C) = (A ∪ B) ∪
C A ∩ (B ∩ C) = (A ∩ B) ∩
C
Commutative laws A ∪B = B ∪
AA∩B=B
∩A
Distributive laws A ∪ (B ∩ C) = (A ∪ B) ∩ (A ∪ C)
A ∩ (B ∪ C) = (A ∩ B) ∪ (A ∩ C)
Identity laws A∪∅ = A
A∩U = A
Domination laws A∪U=U
A∩∅=∅
Absorption laws A∪(A∩B)= A
A∩(A∪B)= A
Cartesian product The combination of all rows in the first table and all
rows in the second table denoted as A X B
