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for every fraction a,b a*b=3ab what is the identity element for *

Quote: Originally Posted by slntennis1 for every fraction a,b a*b=3ab what is the identity element for * What does it mean to be an identitiy. Here is a hint let $\displaystyle e$ be the identity. Then $\displaystyle a*e=a$ and $\displaystyle e*a=a$ for all $\displaystyle a$. Write this out and see what happens.