What are the mode(s) of the dataset {1,3,3,3,5,5,7,9,9,9}\{1, 3, 3, 3, 5, 5, 7, 9, 9, 9\}{1,3,3,3,5,5,7,9,9,9}?
333 only
333 and 999
555 and 777
No mode