Posted by **JENNY** on Thursday, October 25, 2012 at 1:28pm.

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

## Answer this Question

## Related Questions

- math - I do not undeerstand this question for homework. Determine if the set is ...
- math - I do not undeerstand this question for homework. Determine if the set is ...
- SAT prep help - Set M consists of the consecutive integers from -15 to y, ...
- 11th grade mths - Please check urgently .I have to submit the assignment A give ...
- SAT math - Set M consists of the consecutive integers from -15 to y, inclusive. ...
- Maths(please check urgently - Please check urgently .I have to submit the ...
- Maths - A give an example of a function whose domain equals the set of real ...
- Math - The operation § associated to any number means “divide the number by 3”. ...
- discrete math - 1)prove that if x is rational and x not equal to 0, then 1/x is ...
- Math - The average of a set of five different positive integers is 360. The two ...