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Que. The set of positive integers under the operation of ordinary multiplication is:
a. not a monoid
b. not a group
c. a group
d. an Abelian group
Answer:an Abelian group
Nibedita Roy :(April 12, 2019) sir how it is abelian group. can u explain it.
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Ashutosh :(June 22, 2019) Inverse is not available in case of Z+. for eg 3 belongs to Z+ but 1/3 doesn't. Therefore it is not a group.
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