binary operations, commutative / associative

DELETED Sorry

Quote:

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Originally Posted by simond75

a o b = a + b + ab, a * b = a + b + 1
For each binary operations on Z, answer the following with explanations:
A) are the commutative?
B) are they associative?
C) Do thy have an identity element?
D) Are there inverses?
E) Is Z a group with respect to either of these operations?
*Z is of course the symbol for set of integers (with double lines in middle connector)

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The way you posted these, you seem to be saying "I expect you to do these for me".
Not even a please.

Well, it does not work that way. You show some effort. You show your own work.