#2 + a + b = a + 2 + b# is an example of which algebraic property?
It is an example of at least two algebraic properties:
Commutativity and associativity.
#A+B = B+A#
#(A+B)+C = A+(B+C)#
The example also uses associativity to even write
The example also expresses equality, which might also be counted as an algebraic property, but is often just assumed.