And vs. or

Question 1

If set A is {1, 3, 5, 7} and set B is {2, 3, 5, 8, 9}, which numbers are in A and B?

Answer 1

3, 5 are in A and B

Question 2

If set A is {1, 3, 5, 7} and set B is {2, 3, 5, 8, 9}, which numbers are in A or B?

Answer 2

{1, 2, 3, 5, 7, 8, 9} are in A or B

Question 3

If set A is {1, 3, 5, 7} and set B is {2, 3, 5, 8, 9}, which numbers are in A U B?

Answer 3

{1, 2, 3, 5, 7, 8, 9} are in A U B

Question 4

If set A is {1, 3, 5, 7} and set B is {2, 3, 5, 8, 9}, which numbers are in A ∩ B?

Answer 4

{3, 5} are in A ∩ B

Question 5

A ∩ B represents:

a. the union of A and B
b. the intersection of A and B

Answer 5

b. the intersection of A and B

Question 6

A U B represents:

a. the union of A and B
b. the intersection of A and B

Answer 6

a. the union of A and B

Question 7

A ∩ B represents:

a. all of the numbers in set A and B
b. where set A and set B overlap

Answer 7

b. where set A and set B overlap

Question 8

A U B represents:

a. all of the numbers in set A and B
b. where set A and set B overlap

Answer 8

a. all of the numbers in set A and B

Question 9

A U B represents

a. A or B
b. A and B

Answer 9

a. A or B (visualize the U getting a hat to become a O, O for “or”)

Question 10

A ∩ B represents

a. A or B
b. A and B

Answer 10

b. A and B (visualize the ∩ getting a belt across the middle to become a A, A for “and”)

Question 11

The probability of A U B is equal to

a. the probability of A + probability of B
b. probability of A x probability of B

Answer 11

a. the probability of A + probability of B

A U B means A or B, “or” means “add”

Question 12

The probability of A ∩ B is equal to

a. the probability of A + probability of B
b. probability of A x probability of B

Answer 12

b. probability of A x probability of B

A ∩ B means A and B, “and” means “times”

Question 13

The union of A and B means:

a. A or B
b. A and B

Answer 13

a. A or B

Question 14

The intersection of A and B means:

a. A or B
b. A and B

Answer 14

b. A and B

Question 15

If set A is {1, 3, 5, 7} and set B is {2, 3, 5, 8, 9}, which numbers are in the union of A and B?

Answer 15

{1, 2, 3, 5, 7, 8, 9}

Question 16

If set A is {1, 3, 5, 7} and set B is {2, 3, 5, 8, 9}, which numbers are in the intersection of A and B?

Answer 16

{3, 5}

Question 17

If the probability of A is 0.2 and the probability of B is 0.3, what is the probability of A U B?

Answer 17

A U B = probability of A + probability of B = 0.2 + 0.3 = 0.5

Question 18

If the probability of A is 0.2 and the probability of B is 0.3, what is the probability of A ∩ B?

Answer 18

A ∩ B = probability of A x probability of B = 0.2x0.3 = 0.06

Question 19

If the probability of A is 0.2 and the probability of B is 0.3, what is the probability of A or B?

Answer 19

A or B = probability of A + probability of B = 0.2 + 0.3 = 0.5

Question 20

If the probability of A is 0.2 and the probability of B is 0.3, what is the probability of A and B?

Answer 20

A and B = probability of A x probability of B = 0.2x0.3 = 0.06

Question 21

If the probability of A is 0.2 and the probability of B is 0.3, what is the probability of the union of A and B?

Answer 21

union of A and B = probability of A + probability of B = 0.2 + 0.3 = 0.5

Question 22

If the probability of A is 0.2 and the probability of B is 0.3, what is the probability of the intersection of A and B?

Answer 22

intersection of A and B = probability of A x probability of B = 0.2x0.3 = 0.06