Let '&' be a binary operation defined on the set N. Which of the following definitions is commutative but not associative? * O a & b=a+b O a & b=ab O a & b=Da-b O a & b=ab - 8
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- Assume that is a binary operation on a non empty set A, and suppose that is both commutative and associative. Use the definitions of the commutative and associative properties to show that [ (ab)c ]d=(dc)(ab) for all a,b,c and d in A.True or False Label each of the following statements as either true or false. 4. Let . The empty set is the identity element in with respect to the binary operation .15. Let be a binary operation on the non empty set . Prove that if contains an identity element with respect to , the identity element is unique.