Q. 1 B4.4( 19 Votes )
It is given that on Z+, define ∗ by a ∗ b = ab
We can see that for each a, b ϵ Z+, there is a unique element ab in Z+.
⇒ * carries each pair (a, b) to a unique element a * b = ab in Z+.
Therefore, * is a binary operation.
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