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May 22, 2015

Homework Help: Algebra

Posted by CC on Sunday, December 12, 2010 at 10:32am.

An operation is commutative if you can change the order of the numbers involved without changing the result. Addition and multiplication are both commutative. Subtraction is not commutative: 2 - 1 is not equal to 1 - 2. So my question is what’s the difference between 2 - 1 and 1 - 2?

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