Question

If W = {1, 2, 3, 4 …} and subset Z = {positive odd integers}, what is Z'?
Answer
{1, 2, 3, 4 …}
{2, 4, 6, 8, …}
{5, 6, 7, 8 …}
{ }

Answer 1

W is the set of positive integers



Inside of W is the subset Z, which is the set of positive odd integers


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So to form Z', start with W = {1, 2, 3, 4, 5, ...}


Now kick out all of the positive odd integers to get


Z' = {2, 4, 6, 8, ...}

Answer 2

Another name for Z' is the set of positive even integers