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### Grade 8 - Mathematics4.21 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 È B. \ A È B = {x/x Î A or x Î B}. Example: Find A È 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 È B = {1,2,3} È {2,3,6,8} 2. Write all of them in a set. A È B = {1,2,3,2,3,6,8} 3. Remove the common elements and write the remaining elements.\ A È B = {1,2,3,6,8}. Directions: Solve the following problems. Also write at least five examples of your own.
 Q 1: Find A È B, if A = {10,20,30,40} and B = {15,30,45}.{10,15,20,40,45}{10,15,20,30,40}{10,15,20,30,40,45}{15,20,30,40,45} Q 2: Find A È B, if A = {13} and B = {2,4,6,8}.{4,6,8,13}{2,4,6,8,13}None of these{2,4,6,8} Q 3: Find A È B, if A = {22,25,28,31} and B = {25,26}.{22,25,26,28}{22,25,26,28,31}{22,25,28,31}{22,25,26,28,31,34} Q 4: Find A È B, if A = {7,11} and B = {13,17}.{11,13,17}{7,11,13,17}{7,8,9,11,13,17}{7,11,13,} Q 5: Find A È B, if A = {2,3,5,7} and B = {4,6,8}.{2,3,4,5,6,7,8}{2,3,4,5,7,8}{2,4,5,6,7,8}{1,2,3,4,5,6,7,8} Q 6: Find A È B, if A = {2,4} and B = {4,8}.{2,4,6}{2,4,8}{4,6,8}{2,4,6,8} Q 7: Find A È B, if A = {5,7,9} and B = {7,8}.{5,7,8,}None of these{5,7,9}{5,7,8,9} Q 8: Find A È B, if A = {2,4,6,8} and B = {9,10,11,12}.{2,4,6,8,10,11,12}{2,4,6,8,9,10,11,12}{4,6,8,9,10,11,12}{2,4,6,8,9,10,11} Question 9: This question is available to subscribers only! Question 10: This question is available to subscribers only!