11. Which of the following is a subsemigroup of (Q,*) where a*b = ab/5? A. (Z, *) C. (Q+, *) B. (Z+, *) D. (Q-, *)

11. Which of the following is a subsemigroup of (Q,) where ab = ab/5? A. (Z, ) C. (Q+, ) B. (Z+, ) D. (Q-, )

Elements Of Modern Algebra

8th Edition

ISBN:9781285463230

Author:Gilbert, Linda, Jimmie

Publisher:Gilbert, Linda, Jimmie

Chapter5: Rings, Integral Domains, And Fields

Section5.3: The Field Of Quotients Of An Integral Domain

Problem 2E: Prove that addition is associative in Q.

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Question

11. Which of the following is a subsemigroup of (Q,*) where a*b = ab/5?
A. (Z, *) C. (Q+, *)
B. (Z+, *)
D. (Q-, *)

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