math
posted by Kimberly .
I do not undeerstand this question for homework.
Determine if the set is closed for the given operation.
1. yes or no The set of positive fractions for division.
2. yes or no=The set of positive integers for subtraction.
Can someone help me? Is there a website that I can go to to explain this to me. I have had someone send me to a help site before but cannot remember it.
Thank you
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