Question

If P = {people surveyed} and subset C = {people who like cake}, what is C′?

{people who like cookies}
{people who like sweets}
{ }
{people who don't like cake}

Answer 1

I think: people who don't like cake.

Answer 2

melissa15 is correct. C is the set of people who like cake, C' is the complete opposite: the set of people who do NOT like cake.

So in general C' means "everything that is NOT in set C"