Answer:
Step-by-step explanation:
Given
T, T, F, F, S, S....
Required
Fill in the missing letters
To fill in the missing letters, one has to observe and study the pattern carefully;
Closely looking at the pattern, one would notice that the pattern is the first letter of number starting from Two;
The pattern is as follows:
Two, Three, Four, Five, Six, Seven
So, the next two on the list would be Eight and Nine;
Hence, the missing letters are E,N
And the complete pattern is T, T, F, F, S, S, E, N
