# Disjoint of Sets using Venn Diagram

Disjoint

of

sets using Venn diagram is

shown by two non-overlapping closed regions and said inclusions are shown by

showing one closed curve lying entirely within another.

Two sets A and B are said to be disjoint, if they have no

element in common.

Thus, A = {1, 2, 3} and B = {5, 7, 9} are disjoint sets; but the sets C = {3, 5, 7} and D = {7, 9, 11} are not disjoint; for, 7 is the common element of A and B.

Two sets A and B are said to be disjoint, if A ∩ B = ϕ. If A ∩ B ≠ ϕ, then A

and B are said to be intersecting or overlapping sets.

Examples to show disjoint

of sets using Venn diagram:

**1.**

If A = {1, 2, 3, 4, 5, 6}, B = {7, 9, 11, 13, 15} and C = {6,

8, 10, 12, 14} then A and B are disjoint sets since they have no element in

common while A and C are intersecting sets since 6 is the common element

in both.

**2.** **(i)** Let M =

Set of students of class VII

And N = Set of students of class VIII

Since no student can be common to both the classes; therefore

set M and set N are disjoint.

**(ii)** X = {p, q, r, s} and Y = {1, 2, 3, 4, 5}

Clearly, set X and set Y have no element common to both;

therefore set X and set Y are disjoint sets.

**3.**

A = {a, b, c, d} and B = {Sunday, Monday, Tuesday, Thursday}

are disjoint because they have no element in common.

**4. **

P = {1, 3, 5, 7, 11, 13} and Q = {January, February, March}

are disjoint because they have no element in common.

**Note:**

**1.** Intersection of two disjoint sets is always the empty set.

**2.** In each Venn diagram ∪ is the universal set and A, B and C

are the sub-sets of ∪.