This question asks us to find the relationship between the first pair of letters and apply the same relationship to the second term to find the missing letters. This is a common type of letter analogy problem.

Analyzing the Letter Analogy: DFH to HFD

Let's look at the first pair given: DFH and HFD.

• The letters in DFH are D, F, and H.
• The letters in HFD are H, F, and D.

We can observe that the letters in HFD are the same as the letters in DFH, but their order is changed. Let's examine the positions:

• The first letter of DFH is D, which is the last letter of HFD.
• The second letter of DFH is F, which is the second (middle) letter of HFD.
• The third letter of DFH is H, which is the first letter of HFD.

So, the pattern here is that the sequence of letters is simply reversed.

Applying the Pattern to QSU

Now we need to apply the same reversal pattern to the letters QSU.

• The first letter of QSU is Q.
• The second letter of QSU is S.
• The third letter of QSU is U.

Following the reversal pattern:

• The first letter of the new sequence will be the third letter of QSU, which is U.
• The second letter of the new sequence will be the second letter of QSU, which is S.
• The third letter of the new sequence will be the first letter of QSU, which is Q.

Arranging these letters in the new order (U, S, Q) gives us the sequence USQ.

Checking the Options

Let's compare our derived sequence USQ with the given options:

1. UQS: This is not USQ.
2. USQ: This matches our derived sequence.
3. UUS: This contains the letter U twice and is not a rearrangement of QSU.
4. SQO: This contains the letter O which is not in QSU.

Therefore, the letters related to QSU in the same way DFH is related to HFD are USQ.

Conclusion on Letter Analogy

The relationship is a simple reversal of the letters in the sequence. Applying this to QSU gives USQ.

Revision Table: Letter Analogy

Additional Information on Letter Series and Analogies

Letter analogies often involve patterns based on:

• Reversing the order of letters.
• Moving letters forward or backward in the alphabet by a fixed number of positions.
• Skipping letters in the alphabet.
• Using the positional value of letters (A=1, B=2, etc.).
• Combinations of these patterns.

To solve letter analogy problems, carefully examine the first pair to identify the rule or pattern and then apply that rule to the second term.