
 Associativity Summary 
  Thus, the associative property states that combining a with b first, and then combining the result with c, is equivalent to combining b with c first, and then combining a with that result. 
  Subtraction of real numbers is not associative since in general (a  b) c not equal a  (b  c), for example (35  2)  6 = 33  6 = 27, while 35  (2  6) = 35  (4) = 39. 
  When the associative property holds for all the members of a set, every combination of elements must result in another element of the same set. 
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