Mathematics for IGCSE & O level - Sets (Section 1 - No. 34)
Which of the following accurately describes the meaning of the notation n(A)?
The complement of A.
The union of A and the empty set.
The number of elements in A.
The intersection of A and the universal set.
คำอธิบาย
n(A) indicates the cardinality of set A, or the total number of elements present in A.