Mathematics for IGCSE & O level - Sets (Section 3 - No. 27)
If A = {1, 2, 3} and the universal set U = {1, 2, 3, 4, 5}, then A' is:
{1, 2, 3}
{4, 5}
{}
{1, 2, 3, 4, 5}
Explanation
A' contains all elements in the universal set that are not in A.
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