10. (i) The necessary and sufficient condition for $n \equiv 1(\bmod 2)$ is that the absolute minimal residue of $n$ modulo 10 is which numbers?
(ii) The necessary and sufficient condition for $n \equiv-1(\bmod 5)$ is that the minimal positive residue of $n$ modulo 45 is which numbers?
10. (i) $\pm 1, \pm 3,5$;
(ii) $4,9,14,19,24,29,34,39,44$.