Mathematics for IGCSE & O level - Sets (Section 1 - No. 21)
If set A = {1, 2, 3} and the universal set U = {1, 2, 3, 4, 5}, what is A'?
{1, 2, 3}
{4, 5}
{ }
{1, 2, 3, 4, 5}
הֶסבֵּר
The complement of A in U includes all elements in U that are not in A.