SOLUTION: a*b=[{a+b}/5]-1 for all a,b in R, 1.is R closed? 2. is the operation commutative? 3. is the operation associative?

Algebra ->  Distributive-associative-commutative-properties -> SOLUTION: a*b=[{a+b}/5]-1 for all a,b in R, 1.is R closed? 2. is the operation commutative? 3. is the operation associative?      Log On


   

Question 1156540: a*b=[{a+b}/5]-1 for all a,b in R,
1.is R closed?
2. is the operation commutative?
3. is the operation associative?
Answer by ikleyn(52814) About Me  (Show Source):
You can put this solution on YOUR website!
.

What is " R " in your post ?

To answer first question, it is NECESSARY to know WHAT this " R " is.

But your post does not define it . . .