ANSWERS TO SOME QUESTIONS CONCERNING RINGS WITH PROPERTY (A)

A ring R has right property (A) whenever a finitely generated two-sided ideal of R consisting entirely of left zero-divisors has a non-zero right annihilator. As the main result of this paper we give answers to two questions related to property (A), raised by Hong et al. One of the questions has a positive answer and we obtain it as a simple conclusion of the fact that if R is a right duo ring and M is a u. p.-monoid (unique product monoid), then R is right M-McCoy and the monoid ring R[ M] has right property (A). The second question has a negative answer and we demonstrate this by constructing a suitable example.