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Cardinality and Countability
Cardinality and Countability
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compute
A set is COUNTABLE if it has at most as many elements as
N
. Which of the following is countable?
Hide and think first
A.
The power set of the naturals
2
N
(all subsets)
B.
The set of rational numbers
Q
C.
The set of real numbers
R
D.
The set of all functions from
N
to
N
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