SOLUTION: given a=3,5,7 determine the cardinality of a set A and list all posible subset

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Question 1084576: given a=3,5,7 determine the cardinality of a set A and list all posible subset
Answer by MathLover1(20849) About Me  (Show Source):
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A=3,5,7+
the cardinality of a set is the number of elements it contains; so,
the cardinality of a set A is 3
all possible subsets are:
∅ or aleph-zero+
+3
+5
+7
3,5+
+3,7
5,7+
+3,5,7