Final answer:
The cardinality of the set A = {∅} is 1, as it contains one element which is the empty set itself.
Step-by-step explanation:
The question asks us to find the cardinality of the set A = {∅}. Cardinality refers to the number of elements in a set. In this case, the set A contains exactly one element, which is the empty set ∅. Even though the empty set itself contains no elements, it is still considered an element of the set A. Therefore, the cardinality of A is 1.