Test Academy | Let ‘&’ be a binary operation defined on the set N. Which of the following definitions is commutative but not associative? a & b=a-b, a & b=a+b, a & b=ab

Question

Let ‘&’ be a binary operation defined on the set N. Which of the following definitions is commutative but not associative?

Options :

a & b=a-b
a & b=a+b
a & b=ab – 8
a & b=ab

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