MCQ
The binary operation $\times$ defined on $N$ by $a \times b = a + b + ab$ for all $a, b \in N$ is:
  • A
    Commutative only.
  • B
    Associative only.
  • Both commutative and associative.
  • D
    None of these.

Answer

Correct option: C.
Both commutative and associative.

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