Question

If N = {all real numbers} and subset S = {even numbers greater than zero}, what is S′?

{positive numbers}

{even numbers less than zero}

{all real numbers excluding even numbers greater than zero}

{odd numbers greater than zero}

Answer 1

Maybe an example can help:

If S={all the cows in the herd are brown}
then S'={not all the cows in the herd a brown}

S' is the negation of S.

Does that help?