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The sum is the result you get when you add two or more numbers together.

A single number can be the sum of two or more other numbers when they are added together but cannot be expressed as you ask in your question.

Though you could ask "What numbers have the sum of 20?"

For instance 20 is the sum of (10 + 10), (5 + 15), (2 + 7 + 11) etc., but is not in itself a sum.

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13y ago
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Wiki User

13y ago

you need two numbers to get a sum.

just -20 cannot be used for a sum.

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Q: What is the sum of 20?
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