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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

Grade 8 - Mathematics
4.9 Union of Two Sets - II

Example:
A = {1,2,3}, B = {2,3,4} and C = {4,5,6} Find A (B C).

Solution:
First we find B C
B C = {2,3,4} {4,5,6}
= {2,3,4,4,5,6}
Remove the common terms,
B C = {2,3,4,5,6}
A (B C) = {1,2,3} {2,3,4,5,6}
= {1,2,3,2,3,4,5,6}
Remove the common terms,
\ A (B C) = {1,2,3,4,5,6}


Directions: Solve the following problems. Also write at least five examples of your own.
Q 1: A = {9,11,13}, B = {9,11} and C = {9} Find A (B C).
{9,10,11,13}
{9,11,13}
{9,10,11,12,13}
None of these

Q 2: A = {3,5,7,9}, B = {1,2,3,4} and C = {7,8,9,10} Find A (B C).
{1,2,3,4,5,7,8,9}
{1,2,3,4,5,7,8,9,10}
{1,2,3,4,5,6,7,8,9,10}
{1,2,3,5,7,8,9,10}

Q 3: A = {10,20,30,40,50}, B = {11,22,33,44} and C = {15,30,45} Find A (B 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}
{10,11,15,20,22,30,33,40,44,45,50}
{10,11,15,20,22,30,33,37,40,44,45,50}

Q 4: A = {10,12,14}, B = {11,13,15} and C = {9,11,13} Find A (B C).
None of these
{8,9,10,11,12,13,14,15}
{9,10,11,12,13,14,15}
{10,11,12,13,14,15}

Q 5: A = {2,4,6,8}, B = {3,6,9} and C = {4,8,12} Find A (B C).
{2,3,4,6,8,9,10,12}
{2,3,4,5,6,8,9,12}
None of these
{2,3,4,6,8,9,12}

Q 6: A = {2,4,6}, B = {3,5,7} and C = {9,10,11} Find A (B C).
{2,3,4,5,6,7,9,10}
None of these
{2,3,4,5,6,7,8,9,10}
{2,3,4,5,6,8,7,9}

Q 7: A = {5,7,9,11}, B = {7,9,11} and C = {9,11} Find A (B C).
{5,6,7,9,10,11}
{5,7,9,10,11}
{5,7,8,9,11}
{5,7,9,11}

Q 8: A = {1,2,3,4,5}, B = {7,8} and C = {1,3,5} Find A (B C).
{1,2,4,5,6,7,8}
None f these
{1,2,3,4,5,6,7,8}
{1,2,3,4,5,7,8}

Question 9: This question is available to subscribers only!

Question 10: This question is available to subscribers only!


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