The binary operation * defined on N by a * b = a + b + ab for all a, b ∈ N is

The binary operation * defined on N by a * b = a + b + ab for all a, b ∈ N is

A

commutative only

B

associative only

C

both commutative and associative

D

none of these

Answer:

The correct option is C. both commutative and associative

Note