For each of the following determine whether ∗ is a binary operation on R. If so,...

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Advance Math

For each of the following determine whether ∗ is a binaryoperation on R. If so, determine whether or not ∗ is associative,commutative, has an identity element, and has inverse elements.

(a) a ∗ b = (ab) / (a+b+1)

(b) a ∗ b = a + b + k where k ∈ Z

(c) a ln(b) on {x ∈ R | x > 0}

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4.1 Ratings (670 Votes)
a No it is not a binary operation on R This is because it notwell defined for forwhich the output is not well definedb    See Answer
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