1.

A monoid is called a group if _______a) (a*a)=a=(a+c)b) (a*c)=(a+c)c) (a+c)=ad) (a*c)=(c*

A. (a*a)=a=(a+c)
B. (a*c)=(a+c)c) (a+c)=ad) (a*
C. (a*c)=(a+c)c) (a+c)=a
D. (a*c)=(c*a)=e
Answer» E.


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