What is the cardinality of each of these sets? a) {a} b) {{a}} c) {a, {a}} d) {a, {a}, {a, {a}}}
Cardinality of a finite set is the number of elements in it.
There is 1 element in {a}, 1 element in {{a}}, 2 elements in {a, {a}}, 3 elements in {a, {a}, {a, {a}}}.
Thus:
a) 1
b) 1
c) 2
d) 3
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