In the word SELFRIGHTEOUSNESS, all the letters are reversed so that the last letter comes first and the first letter goes to the last position. Which single letter of SELFRIGHTEOUSNESS does not change its position when the letters are completely reversed in this way?

Introduction / Context:
This question is about symmetry when a word is reversed. The word SELFRIGHTEOUSNESS is reversed completely and we are asked which letter remains in exactly the same position as before. This type of alphabet test question examines visualisation skills and understanding of how positions are mirrored when a string of characters is reversed from end to end.

Given Data / Assumptions:

The word in question is SELFRIGHTEOUSNESS.
The entire word is reversed, so the last letter becomes first and so on.
The task is to find a letter whose position from the left remains unchanged after this full reversal.
We assume a straightforward reversal, not any partial or conditional reversal.

Concept / Approach:
When a sequence of characters is reversed, the first and last positions swap, the second and second last positions swap, and so on. If there is an odd number of letters, the exact middle position will remain fixed because there is no counterpart to swap with. Therefore, the main approach is to count the number of letters in SELFRIGHTEOUSNESS, find the middle position, and identify the letter that lies there. That middle letter will remain in the same position even after reversal.

Step-by-Step Solution:

Verification / Alternative check:
To verify, you can actually reverse the word SELFRIGHTEOUSNESS on paper by writing the letters from right to left. You will obtain SSEN SUO THGRIFLES. If you now number these reversed letters from 1 to 17, you will again find that the 9th position is occupied by T. Since both the original and reversed forms have T at position 9, this confirms that T is the letter whose position remains unchanged after reversal.

Why Other Options Are Wrong:

G appears at position 7 in the original word and moves to position 11 after reversal, so it does not stay fixed.
E appears at several positions (2, 10 and 15), none of which remain the same when the word is reversed, so E is not the required letter.
H occupies position 8 originally and moves to position 10 after reversal, therefore its position does change and it cannot be the answer.

Common Pitfalls:
Many students try to mentally reverse the entire long word and can easily miscount positions. Others forget that only an odd length word has a single central letter that remains fixed, while in an even length word no single letter stays in the same position. A careful count of the letters and a quick sketch of positions help avoid these errors and make such questions straightforward.

Final Answer:
The only letter in SELFRIGHTEOUSNESS that does not change its position when the word is reversed is T.