Q. 2 C4.9( 10 Votes )

# For each operation ∗ defined below, determine whether ∗ is binary, commutative or associative.

On Q, define a ∗ b =

Answer :

It is given that On Q, define a ∗ b =

Now, ϵ Q, so the operation * is binary.

We know that ab = ba for a,b ϵ Q

⇒ = for a, b ϵ Q

⇒ a * b = a * b for a,b ϵ Q

⇒ The operation * is commutative.

Also for all a,b,c ϵ Q, we get,

(a * b) * c = () * c =

a * (b * c) = a * () =

⇒ (a * b) * c = a * (b * c)

⇒ the operation * is associative.

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