fug
T, U, V They are all mirrored letters.
The question is garbled, so it's not really solvable as asked. The question is supposed to be "Determine the next three letters in this sequence: D T N T L" The answer is "I T S"--the sequence is the first letters of the words in the question. But it doesn't really work if the wording is not exact.
u g y h j
s o.
Those are the initial letters of the months of the year - in order.
It isn't scrambled: it is the months of the year listed in order using their first letters.
abcde
z
fug
The next three letters in this sequence follow by days of the week. S is sunday, m is monday t is tuesday, w is wednesday, so the next three letters are tfs because thursday friday saturday.
MAMJJASO are the initial letters of the months from March through October, so the next letter in the sequence is N for November.
jj
c
T, U, V They are all mirrored letters.
The question is garbled, so it's not really solvable as asked. The question is supposed to be "Determine the next three letters in this sequence: D T N T L" The answer is "I T S"--the sequence is the first letters of the words in the question. But it doesn't really work if the wording is not exact.
The next sequence of letters following OBAFGKM in the spectral classification system are L, T, Y. These letters are used to classify cooler and less luminous stars outside the main sequence, such as brown dwarfs.