1. Give a reduced residue system modulo 12
1. Give a reduced residue system modulo 12.
I suppose the best answer is 1; 5; 7; 11. Warning! A reduced residue system
modulo n is required to contain a representative for every number that is
relatively prime to n. So 1; 7; 11 is not a reduced residue system modulo
12. Raji, no doubt, meant to say that, although his De
nition 14 does not
include that requirement.