what is x+y+z is x,y and z are integers and xy-1 is divisible by z, yz-1 is divisible by x and xz-1 is divisible by y.
closed as off-topic by Michael Albanese, Greg Martin, Gerry Myerson, Andreas Blass, Steven Landsburg Feb 4 '18 at 23:03
This question appears to be off-topic. The users who voted to close gave this specific reason:
- "This question does not appear to be about research level mathematics within the scope defined in the help center." – Michael Albanese, Greg Martin, Gerry Myerson, Andreas Blass, Steven Landsburg