Find the intersection of the sets A = {3, 4, 7, 9, 13} and B = {3, 7, 10, 13, 17}.

Question

null set
{3, 7, 13}
{3, 4, 7, 9, 10, 17}
{3, 4, 7, 9, 10, 13, 17}--- my answer

Question 3.3. Choose the correct answer.
Find the union of the two sets A = {4, 8, 10, 12, 14} and B = {12, 14}.

{12, 14}
{4, 8}--- my answer
{10}
{4, 8, 10, 12, 14}

Question 4.4. Choose the correct answer.
Find the intersection of the three sets: A = {1, 3, 5, 7, 9}, B = {1, 2, 3, 5, 7}, and C = {1, 2, 5, 8, 9}.

{1, 5}
{1, 2, 5}
{1, 3, 5, 7}
{1, 2, 3, 5, 7, 8, 9}-- my answer

Answer 1

You found the union, not the intersection.

3.3: You found A-B, not the union.

4.4: Again, you found the union. The intersection is the elements in all three sets: {1,5}