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PracticeTest2

# PracticeTest2 - RED Name Instructor Pace Nielsen Math 290...

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RED Name: Instructor: Pace Nielsen Math 290 Sample Exam 2 Note that the first 10 questions are true-false. Mark A for true, B for false. Questions 11 through 20 are multiple choice–mark the correct answer on your bubble sheet. Answers to the last five questions should be written directly on the exam, and should be written neatly and correctly. True-false questions 1. Let R be an equivalence relation on a nonempty set A , and let a, b A . Then [ a ] = [ b ] if and only if aRb . 2. If | A | = 1 and R is a reflexive relation on A , then R is an equivalence relation. 3. If f : A B is injective, and g : B C is surjective, then g f : A C is bijective. 4. If R is an equivalence relation on a finite nonempty set A , then the equivalence classes of R all have the same number of elements. 5. Let A be a set and let R be an equivalence relation on A . Suppose that a and b are in A , that there are exactly eight elements x such that xRa and there are exactly nine elements y such that yRb . Then it is possible that aRb . 6. Let A = { a, b, c, d } and let R be an equivalence relation on A . Suppose that aRb , cRd , and dRc . Then it must be the case that aRd .

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PracticeTest2 - RED Name Instructor Pace Nielsen Math 290...

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