Q9- 6 points Use an element argument to prove the following statement: For all sets A and B, if A ⊆ B, then BC ⊆ AC.

Q5 – 6 points Let A = {p, q, r}, B = {0, 1, 3}, and C = {0, 4}. Use set-roster notation to write the following set: A × (B ∪ C).    

Q7- 6 points Consider the following statement: For all sets A and B, (A ∪ B) ∩ C  =  A ∪ (B ∩ C) Write a sentence that describes what would be required to show that this statement is false, and find subsets of {1, 2, 3, 4, 5, 6} which can be used to meet that requirement.

Q12 – 6 points Draw a Venn diagram for sets A, B and C satisfying the following conditions: A ⊆ C, B ⊆ C, A ∩ B = ∅.

Q3 – 6 points Let Z be the set of all integers and let  A0 = {n ∈ Z | n = 3k, for some integer k} A1 = {n ∈ Z | n = 3k + 1, for some integer k}  and Is {A0, A1}  a partition of Z? Explain why or why not?

 Q13 – 6 points Define a function F : Z × Z → Z × Z as follows: F(x, y) = (3y−1, 1−x) for all (x, y) in Z × Z.  Find F(0, 0) and F(1, 4).

I have read and understand RIT’s Student Academic Integrity Policy

Q15 – 6 points Define a function f : Z → Z by the rule f(n) = 4n + 1 , for every integer n. Is f an onto function? Is f a one-to-one function? Prove using the definitions of onto and one-to-one.

Q2 – 9 points Let G = {1, 2, 3} and  H = {5, 6, 7} and define a relation R from G to H as follows: For every (x, y) ∈ G × H,  (x, y) ∈ R  means that  (x – y)/2  is an integer. Is 3 R 6? Is (2, 7) ∈ R? Write R  as a set of ordered pairs.  

Q3 – 6 points Let Z be the set of all integers and let  A0 = {n ∈ Z | n = 4k, for some integer k} A1 = {n ∈ Z | n = 4k + 1, for some integer k}  and A2 = {n ∈ Z | n = 4k + 2, for some integer k}. Is {A0, A1, A2}  a partition of Z? Explain why or why not?