The cardinal number for the set is 5.
The size of a finite set (even comprehended as its cardinality) exists calculated by the number of elements it has. Remember that counting the number of elements in a set amounts to creating a 1-1 correspondence between its elements and the numbers in {1,2,...,n}.
The cardinal number (or cardinality) of set A, represented by n(A), exists as the number of distinct elements in set A
Since set A contains 5 distinct elements, then:
n(A) = 5
Therefore, the cardinal number for the set is 5.
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