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Question

Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.

LGG, PJL, KMO, OPT, LSG, ?

This question was previously asked in
SSC CGL 2020 (Tier-2) Statistics Previous Year Paper 3 (28-Jan-2022)
The correct answer is

PVL

Letter Cluster Series Analysis

This solution focuses on deciphering the pattern in the given letter series: LGG, PJL, KMO, OPT, LSG, ?. We will determine the logic behind the sequence by analyzing the positions of the letters in the English alphabet.

Step 1: Assigning Alphabetical Positions

First, let's convert each letter cluster into its corresponding numerical positions (A=1, B=2, ..., Z=26).

  • LGG corresponds to (12, 7, 7)
  • PJL corresponds to (16, 10, 12)
  • KMO corresponds to (11, 13, 15)
  • OPT corresponds to (15, 16, 20)
  • LSG corresponds to (12, 19, 7)

Step 2: Identifying the Pairwise Transformation Pattern

Observing the series, we can see a pattern emerging when we look at consecutive pairs of clusters (LGG -> PJL, KMO -> OPT).

Let's calculate the difference in positions between the letters of the first pair:

LGG to PJL Transformation
Position LGG PJL Difference
1st Letter L (12) P (16) $16 - 12 = 4$
2nd Letter G (7) J (10) $10 - 7 = 3$
3rd Letter G (7) L (12) $12 - 7 = 5$

The transformation from LGG to PJL is +4, +3, +5.

Now, let's check if the same transformation applies to the next pair (KMO to OPT):

KMO to OPT Transformation
Position KMO OPT Difference
1st Letter K (11) O (15) $15 - 11 = 4$
2nd Letter M (13) P (16) $16 - 13 = 3$
3rd Letter O (15) T (20) $20 - 15 = 5$

The transformation from KMO to OPT is also +4, +3, +5.

This confirms a consistent pattern where each pair of clusters is related by adding 4 to the first letter's position, 3 to the second letter's position, and 5 to the third letter's position.

Step 3: Calculating the Missing Letter Cluster

To find the missing cluster after LSG, we apply the same transformation (+4, +3, +5) to LSG.

  • Current Cluster: LSG
  • Letters and Positions: L (12), S (19), G (7)

Applying the transformation:

  • First Letter: L (12) $+ 4 = 16$. The 16th letter is P.
  • Second Letter: S (19) $+ 3 = 22$. The 22nd letter is V.
  • Third Letter: G (7) $+ 5 = 12$. The 12th letter is L.

Combining these results, the next cluster in the series is PVL.

Conclusion

The letter series follows a pattern where each cluster is transformed into the next within pairs using the positional increments (+4, +3, +5). Applying this confirmed pattern to the cluster LSG yields PVL, which is the correct letter cluster to replace the question mark.

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