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A rational number is a type of real numbers, which can be written in the form p/q, where p and q are integers and q is non-zero.
1/5 is a rational number since 1 and 5 are integers and 5 is non-zero.
1/4 is a rational number since 1 and 4 are integers and 4 is non-zero.
1/3 is a rational number since 1 and 3 are integers and 3 is non-zero.
1/2 is a rational number since 1 and 2 are integers and 2 is non-zero.
So, the given set of numbers are rational numbers.