zikabunch zikabunch 30-01-2024 Mathematics contestada 1. Let A = { n ∈ ℤ | n=5r for some integer r } and B = { m ∈ ℤ | m = 20s for some integer s } . Prove or disprove each of the following statements. 1. A ⊆ B 2. B ⊆ A