Let A = {x ? Z
Chapter 6, Problem 6E(choose chapter or problem)
Problem 6E
Let A = {x ∈ Z | x = 5a + 2 for some integer a}, B = {y ∈ Z | y = 10b – 3 for some integer b}, and C = {z ∈ Z | z = 10c + 7 for some integer c}.
Prove or disprove each of the following statements.
a. A ⊆ B
b. B ⊆ A H
c. B = C
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