The answer is commutative - addition!
The reason it is not associative is because while the direction changes, the parentheses does not move! In the associative, the parenthesis moves, but in (a + b) + c = c + (a + b), the parenthesis contains a + b in both of them. Also here is some picture proof. (Attached)
⭐ Answered by Hyperrspace (Ace) ⭐
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