Associative Property of Addition
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Definition
Associative Property of Addition
[math]\left (a+b\right )+c=a+\left (b+c\right)[/math].

Supplementary definitions
Associativity 

In mathematics, associativity is a property that a binary operation can have. It means that, within an expression containing two or more of the same associative operators in a row, the order that the operations are performed does not matter as long as the sequence of the operands is not changed. That is, rearranging the parentheses in such an expression will not change its value. This extract is licensed under the Creative Commons AttributionShareAlike license. It uses material from the article "Associativity", retrieved 7 Jan 2009. 
Examples
 [math](5+3)+1=5+(3+1)=9 \,[/math]
 [math](15+5+1)+10=(15+5)+(1+10)=15+(5+1+10)=31\,[/math]
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