# DETERMINE THE ELEMENTS OF GIVEN SETS FROM VENN DIAGRAM

Operations involving set theory :

(i) Union

The union of two sets A and B is the set of all those elements which are either in A or in B, i.e. A ∪ B

(ii) Intersection

The intersection of two sets A and B is the set of all elements which are common. The intersection of these two sets is denoted by A ∩ B.

(iii) Difference

The set which contains the elements which are either in set A or in set B but not in both is called the difference between two given sets.

(iv) Complementation

In set theory, the complement of a set A, often denoted by Ac (or A′), are the elements not in A. A circle filled with red inside a square.

Problem 1 :

Find the following in the venn diagram.

 a) List :i) set Cii) set Diii) set Uiv) set C ∩ Dv) set C ∪ D b) Find :i) n(C)ii) n(D)iii) n(U)iv) n(C ∩ D)v) n(C ∪ D)

Solution :

i) set C = {1, 3, 7, 9}

ii) set D = {1, 2, 5}

iii) set U = {1, 2, 3, 4, 5, 6, 7, 8, 9}

iv) set C ∩ D = {1}

v) set C D = {1, 2, 3, 5, 7, 9}

b)

i) n(C) = 4

ii) n(D) = 3

iii) n(U) = 9

iv) n(C ∩ D) = 1

v) n(C D)

n(C D) = n(C) + n(D) n(C ∩ D)

= 4 + 3 – 1

= 6

Problem 2 :

Find the following.

 i) set A ii) set B iii) set U iv) set A ∩ B v) set A ∪ B i) n(A) ii) n(B) iii) n(U) iv) n(A ∩ B) v) n(A ∪ B)

Solution :

i) set A = {2, 7}

ii) set B = {1, 4, 6}

iii) set U = {1, 2, 3, 4, 5, 6, 7, 8}

iv) set A ∩ B = { }

v) set A B = {1, 2, 4, 6, 7}

b Find :

i) n(A) = 2

ii) n(B) = 3

iii) n(U) = 8

iv) n(A ∩ B) = { }

v) n(A B)

n(A B) = n(A) + n(B) n(A ∩ B)

= 2 + 3 – {}

= 5

Problem 3 :

a) List the elements of :

i) U       ii) N         iii) M

b) What are n(N) and n(M)?

c) Is M   N?

Solution :

i) U = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}

ii) N = {8, 3}

iii) M = {1, 4, 7}

b) n(N) = 2 and n(M) = 3

c) M  N = {1, 3, 4, 7, 8}

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