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A binary operation acting on two numbers (real or complex) must give the same answer. They cannot give two different answer. If different answers are required the binary operations must be different and, to identify the numbers involved, these binary operations must be specified.

For example, 13.5 and 34.5 give 21 as a difference and 48 as a sum. There will be another pair for addition and multiplication, still another pair for subtraction and multiplication, etc.

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13y ago
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Q: What two numbers equal 21 and 48?
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