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Let [tex]R = \{ a/b : a, b \in \mathbb{Z}, b \equiv 1 (\mod 2) \}[/tex].

a) was find the units, b) was show that [tex]R\setminus U(R)[/tex] is a maximal ideal. Both I was successful. But

c) is find all primes, which I believe i only found one...the rational number 2.

d) find all ideals and show that [tex]R[/tex] is a PID.

Any help would be appreciated.