Algebra-1

The number that is both a natural and a rational number is 3. It is a natural number (since it is a positive integer) and a rational number because it can be expressed as 3/1.

Option A: -4, it is a rational number because it can be expressed as -4/1. However, it is not a natural number. Natural numbers are positive integers starting from 1 (1, 2, 3, ...).

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