Definition of union:The set of all element of set A and set B is called union and removing all repeated element in union of set A and B. mathematically sign of union is U. A union B set is denoted by

A U B

A union B set Venn diagram:

EXAMPLE:

A = { 1,2,3,4}, B = { 3, 4,5}

A U B = { 1,2,3,4}U{ 3, 4,5} = { 1,2,3,4,5}

Here 3 and 4 are repeated element we removed it.

UNION in set form symbolically:

The union of two set A and B , is denoted by A U B is the set of all element , which belong to A or B , Symbolically.