1.{x2:x€A} 2.{ :x€A} 3.{2x:x€A} 4.{4x+1:x€A}
2. {1, 2, 3, 4, 5} 3. {2, 4, 6, 8, 10} 4. {5, 9, 13, 17, 21}
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