http://i453.photobucket.com/albums/q...y188/math9.jpg

This question confuses me in many ways, by "non-zero" is it meant a ring with no divisors of zero?

As an ID is a commutative ring-with-a-1 no divisors of zero, I guess i'm going to have to show there does exist a divisor of zero in R1 X R2?

Not sure at all how to go about starting this one...