Name the property illustrated by the sentence 7 a b 7 a

Name the property illustrated by the sentence. 7 + (a + b) = (7 + a) + b Commutative property of addition Additive inverse property Associative property of addition Additive identity property None of these

As per associative property of addition means: Regrouping the numbers without changing the order

eg : (3 +2)+1 = 3 +(2+ 1)