Am looking for the answer the the math problem below. This is in set theory/element or subsets. This falls under that category. Thanks

Let U = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20},

C = {1, 3, 5, 7, 9, 11, 13, 15}.

C' =

Use a comma to separate answers as needed. Use ascending order.)