Posted by
**JENNY** on
.

explain why are the following not groups:

1)the set of Z integers with operation subtraction

2)The set of Z integers with operation addition

3)The set of R* of all non zero real numbers with addition

Wednesday

March 29, 2017
Posted by
**JENNY** on
.

explain why are the following not groups:

1)the set of Z integers with operation subtraction

2)The set of Z integers with operation addition

3)The set of R* of all non zero real numbers with addition

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