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Associative Law

It allows for the removal of brackets from an expression and regrouping of the variables.
i.e.
➡ (A + B) + C = A + (B + C)
➡ (A.B).C = A.(B.C) 
Proof:



Hence, (A + B) + C = A + (B + C) & (A.B).C = A.(B.C)