Which of the following letter-number

We are given the series:

DHK31, EIL40, FJM49, GKN58, ?

We need to find the next cluster.

Step 1: Analyze the letters

Take each cluster separately:

1. DHK

2. EIL

3. FJM

4. GKN

Look at each position of letters:

• 1st letter: D, E, F, G → increases by 1 each time → next = H

• 2nd letter: H, I, J, K → increases by 1 each time → next = L

• 3rd letter: K, L, M, N → increases by 1 each time → next = O

✅ So, the letters of the next cluster = HLO

Step 2: Analyze the numbers

Series of numbers: 31, 40, 49, 58

Difference between consecutive numbers:

• 40 − 31 = 9

• 49 − 40 = 9

• 58 − 49 = 9

✅ The difference is constant (9), so the next number = 58 + 9 = 67

Step 3: Combine letters and numbers

Next cluster = HLO67

✅ Answer: HLO67