Mathematics

The complement of a set is simply all the elements that belong to your universal set but don't belong to your target set. Think of it as "what's left over" — you're identifying which members of $U$ are missing from $A$. Just list out each element in $U$ and ask yourself: is this in $A$? If no, it goes in the complement.

The complement of a set is simply all the elements that belong to your universal set but don't belong to your target set. Think of it as "what's left over" — you're identifying which members of $U$ are missing from $A$. Just list out each element in $U$ and ask yourself: is this in $A$? If no, it goes in the complement.