Rational numbers, such as 1/2, 3, -5, and 0.75, can be written as p/q, where p and q are integers and q ≠ 0. They are either repeated or terminating in their decimal representation.
Irrational numbers have non-terminating, non-repeating decimal expansions (such as √2, π, and e) and cannot be represented as p/q.
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