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What is a set?

• A random collection of items

• A collection of well-defined objects

• A group of numbers only

• A collection of letters

Which of the following is an example of a well-defined set?

• The set of kind students in your school

• The set of all intelligent people

• The set of all beautiful girls in the class

• The set of students in Ethiopia

What is the notation for the empty set?

• {0}

• ∅

• []

• null

If A = {1, 2, 3} and B = {1, 2, 3, 4}, what can be concluded?

• A ∩ B = ∅

• A ⊆ B

• B ⊆ A

• A = B

What is the union of two sets A and B?

• The set of all elements in A or B

• The set of all elements in A and B

• The set of elements in B but not in A

• The set of elements in A but not in B

What is the result of the intersection of two disjoint sets?

• A set with only the common elements

• A set with all elements from both sets

• None of the above

• An empty set

Which of the following is a rational number?

• π

• 2.112111211112...

• 1/2

• √3

What is the sum of the roots of the equation 3x² + 8x + 5 = 0?

• -5/3

• 5/3

• -8/3

• 8/3

What is the GCF of 36 and 56?

• 4

• 6

• 8

• 2

Which of the following is a characteristic of composite numbers?

• They cannot be divided

• They have more than two factors

• They are always prime numbers

• They have exactly two factors