Select the letter-cluster that can replace the question mark (?) in the following series.TXB,QWE,NVH,KUK,?ITMJTMHTNHSN

To solve the problem, let's break it down step by step.

1. Break Down the Problem

We need to analyze the given series: TXB, QWE, NVH, KUK, ?ITMJTMHTNHSN and find a pattern to determine what should replace the question mark (?).

2. Relevant Concepts

We will examine the sequences of letters in each cluster to determine if there is a recognizable pattern. This could involve looking for patterns in the letters themselves or the positions of the letters in the alphabet.

3. Analysis and Detail

Let's break down each of the clusters:

• TXB
• QWE
• NVH
• KUK

We will analyze the first letters of each cluster:

1. T (20th letter)
2. Q (17th letter)
3. N (14th letter)
4. K (11th letter)

Notice that each letter decreases by 3:

• 20 (T) - 3 = 17 (Q)
• 17 (Q) - 3 = 14 (N)
• 14 (N) - 3 = 11 (K)

Continuing this pattern:

• 11 (K) - 3 = 8, which gives us the letter H.

Next, let’s look at the second letters of each cluster:

1. X (24th letter)
2. W (23rd letter)
3. V (22nd letter)
4. U (21st letter)

Each letter decreases by 1:

• 24 (X) - 1 = 23 (W)
• 23 (W) - 1 = 22 (V)
• 22 (V) - 1 = 21 (U)

Continuing:

• 21 (U) - 1 = 20, which gives us the letter T.

Now, the third letters:

1. B (2nd letter)
2. E (5th letter)
3. H (8th letter)
4. K (11th letter)

Each letter increases by 3:

• 2 (B) + 3 = 5 (E)
• 5 (E) + 3 = 8 (H)
• 8 (H) + 3 = 11 (K)

Continuing:

• 11 (K) + 3 = 14, which gives us the letter N.

4. Verify and Summarize

Based on our substitutions from the identified patterns, the next cluster should be HTN.

Final Answer

The letter-cluster that can replace the question mark (?) is HTN.