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### Grade 8 - Mathematics4.9 Union of Two Sets - II

 Example: A = {1,2,3}, B = {2,3,4} and C = {4,5,6} Find A È (B È C). Solution: First we find B È C B È C = {2,3,4} È {4,5,6} = {2,3,4,4,5,6} Remove the common terms, B È C = {2,3,4,5,6} A È (B È C) = {1,2,3} È {2,3,4,5,6} = {1,2,3,2,3,4,5,6} Remove the common terms, \ A È (B È C) = {1,2,3,4,5,6} Directions: Solve the following problems. Also write at least five examples of your own.
 Q 1: A = {7,8,9}, B = {2,3} and C = {5,7} Find A È (B È C).{2,3,4,5,7,8,9}{2,3,4,5,6,7,8,9}{2,3,5,6,7,8,9}{2,3,5,7,8,9} Q 2: A = {3,5,7,9}, B = {1,2,3,4} and C = {7,8,9,10} Find A È (B È C).{1,2,3,4,5,6,7,8,9,10}{1,2,3,4,5,7,8,9,10}{1,2,3,4,5,7,8,9}{1,2,3,5,7,8,9,10} Q 3: A = {10,12,14}, B = {11,13,15} and C = {9,11,13} Find A È (B È C).None of these{8,9,10,11,12,13,14,15}{10,11,12,13,14,15}{9,10,11,12,13,14,15} Q 4: A = {1,2,3,4,5}, B = {2,4,6} and C = {1,3,5} Find A È (B È C).None of these{1,2,3,4,5}{1,2,3,4,5,6}{2,3,4,5,6} Q 5: A = {2,4,6}, B = {3,5,7} and C = {9,10,11} Find A È (B È C).{2,3,4,5,6,7,9,10}{2,3,4,5,6,7,8,9,10}{2,3,4,5,6,8,7,9}None of these Q 6: A = {9,11,13}, B = {9,11} and C = {9} Find A È (B È C).None of these{9,10,11,12,13}{9,11,13}{9,10,11,13} Q 7: A = {10,20,30,40,50}, B = {11,22,33,44} and C = {15,30,45} Find A È (B È C).{10,11,15,20,22,30,32,33,40,44,45,50}{10,11,12,15,20,22,30,33,40,44,45,50}{10,11,15,20,22,30,33,37,40,44,45,50}{10,11,15,20,22,30,33,40,44,45,50} Q 8: A = {2,4,6,8}, B = {3,6,9} and C = {4,8,12} Find A È (B È C).{2,3,4,6,8,9,12}{2,3,4,6,8,9,10,12}None of these{2,3,4,5,6,8,9,12} Question 9: This question is available to subscribers only! Question 10: This question is available to subscribers only!

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