Answers:

A.  List the elements of the following sets:

1. A = {-3, 3}
   
   
2. B = {7, 11, 13}
   
   
3. C = {-18, -15, -12, -9, -6, -3}
   
   
4. D = {2}
   
   
   
   

B.  Define the following sets using setbuilder notation.

1. {x  Z  | x > 0 x = 2p for some integer p}
   
   
2. {x  | f(x)}
   
   
3. {x  R  | x5 }
   
   
4. {x  Z⁺ | x3p for some integer p}