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What do n and r mean in mathematics?
N represents a set of positive integers (including 0).

N* represents a set of positive integers (excluding 0).

R stands for a set of real numbers.

R+ stands for a set of positive real numbers.

R- stands for negative real number set.

R* stands for a set of non-zero real numbers.

Z stands for the set of all integers.

Q stands for a set of rational numbers.