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In mathematics, a binary operation, often denoted *, on a set is a way of combining a pair of elements in that set that results in another element of the set. For example, if we take a pair of natural numbers and let the operation * be addition, then their sum is also a natural number, and is the result of applying this particular binary operation. Another example of an operation on the natural numbers is multiplication. For instance, take the natural numbers 2 and 3. When multiplied together they give 6, another natural number.