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M: +2.00/-0.66

Let N be the set of natural numbers. Consider the following sets:
P. Set of rational numbers (positive and negative).
Q. Set of functions from {0, 1} to N.
R. Set of functions from N to {0, 1}.
S. Set of finite subsets of N.
Which of the sets above are countable?

[GATE CS 2018]
A
B
C
D
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