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Grade 8 - Mathematics
4.21 Union of Two Sets - I

Union of Sets:
The set which contains all the elements which belongs to either A or B both is called the union of of A and B and is denoted by A B.
\ A B = {x/x A or x B}.

Example:
Find A B, if A = {1,2,3} and B = {2,3,6,8}.

Solution:
Steps:
1. Write all the elements in A and write all the elements in B
A B = {1,2,3} {2,3,6,8}
2. Write all of them in a set.
A B = {1,2,3,2,3,6,8}
3. Remove the common elements and write the remaining elements.
\ A B = {1,2,3,6,8}.


Directions: Solve the following problems. Also write at least five examples of your own.

Name: ___________________

Date:___________________

Grade 8 - Mathematics
4.21 Union of Two Sets - I

Q 1: Find A B, if A = {1,2,3,4} and B = {2,4,6}.
{1,2,3,4,6}
{1,2,3,4,5,6}
None of these
{1,2,3,5,6}

Q 2: Find A B, if A = {5,7,9} and B = {7,8}.
{5,7,8,}
{5,7,9}
{5,7,8,9}
None of these

Q 3: Find A B, if A = {2,4,6,8} and B = {9,10,11,12}.
{2,4,6,8,9,10,11}
{2,4,6,8,9,10,11,12}
{2,4,6,8,10,11,12}
{4,6,8,9,10,11,12}

Q 4: Find A B, if A = {22,25,28,31} and B = {25,26}.
{22,25,26,28,31,34}
{22,25,26,28,31}
{22,25,28,31}
{22,25,26,28}

Q 5: Find A B, if A = {2,3,5,7} and B = {4,6,8}.
{2,3,4,5,6,7,8}
{2,4,5,6,7,8}
{2,3,4,5,7,8}
{1,2,3,4,5,6,7,8}

Q 6: Find A B, if A = {1,3,5,7} and B = {2,4,6,8}.
{1,2,3,4,5,6,7,8}
{1,2,3,4,5,6,7}
{1,2,35,6,7,8}
{2,3,4,5,6,7,8}

Q 7: Find A B, if A = {7,11} and B = {13,17}.
{11,13,17}
{7,11,13,}
{7,11,13,17}
{7,8,9,11,13,17}

Q 8: Find A B, if A = {2,4} and B = {4,8}.
{4,6,8}
{2,4,6}
{2,4,6,8}
{2,4,8}

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Question 10: This question is available to subscribers only!


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