Binary operation

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A binary operation is a mathematical operation (a.k.a. function) that takes two arguments (or inputs) and returns one output. Common examples of binary operations are addition, which takes the two addends as arguments and returns a sum, and multiplication, which takes two factors as arguments and returns a product. The word "binary" means two; there are also unary operations (1 argument), ternary operations (3 arguments) and more generally, n-ary operations (n arguments).