Is the following array a partition or not?

(i) s={1,2,3,4,5,6,7,8,9}, {{1,3,5},{2,6},{4,8,9,}}
(ii) s={1,2,3,4,5,6,7,8,9}, {{1,3,5},{2,4,6,8},{5,7,9}}
(iii) s={1,2,3,4,5,6,7,8,9}, {{1,3,5},{2,4,6,8},{7,9}}