III. Write each set using roster notation or listing method:
26. Vowel letters in the word FACETIOUS 27. Distinct letters in the word HUMOROUS
28. ] = {x/x is the distinct letters in the word FACETIOUS}
29.0 = {x/x is a counting number less than one)
30. Y = {x/x is the months of the year having 31 days)​