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Geometry 24 Online
OpenStudy (anonymous):

Determine which, if either, of the following sets form a group with respect to the given operation. I. {1,2,3,4,5}; Multiplication modulo 7. II. the set of integers with respect to multiplication.

OpenStudy (perl):

I. make a table for multiplication modulo 7 , check that each row has an inverse, etc

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