week 1 Flashcards
1
Q
AUB
A
consists of every element that is in either A or B (or both)
called the union of A and B
or
2
Q
AnB
A
consists of every element that is in both A and B
intersection.
and
N= but
3
Q
n(U)
A
Universal set
set of all elements under consideration in the problem
4
Q
A^c
A
A complement
consists of every element of U that is not in A
5
Q
A⊆B
A
A is a subset of B
if all the elements of A are also in B
6
Q
∅
A
The empty set
always a subset of any set
7
Q
A⊆A
A
A set is always a subset of itself
8
Q
n(AUB)=
A
n(A) + n(B) - n(AnB)
9
Q
n(AnB)=
A
n(A) + n(B) - n(AUB)
10
Q
n(A^c)=
A
n(U) - n(A)
n(A^c n B) + n(A^c n B ^c)
11
Q
n(A)=
A
n(AnB) + n(AnB^c)
12
Q
De Morgan’s Laws
(AnB)^c=
A
A^c U B^c
13
Q
De Morgan’s Laws
(AUB)^c=
A
A^c n B^c
