Which of the following letter-clusters will replace the question mark (?) in the given series? DBK, GDL, JFM, MHN, ?
Solving Letter Series Patterns
This question asks us to find the next term in a given series of letter clusters: DBK, GDL, JFM, MHN, ?. To solve this, we need to identify the pattern governing the progression of letters in each position within the clusters.
Let's analyze the series by looking at the letters in the first, second, and third positions separately.
Analyzing the First Letter Sequence
The first letters in the series are: D, G, J, M, ?
Let's find the positional value of each letter in the English alphabet:
- D is the 4th letter.
- G is the 7th letter.
- J is the 10th letter.
- M is the 13th letter.
The sequence of positional values is 4, 7, 10, 13, ?. We can see a consistent pattern:
$$4 \xrightarrow{+3} 7$$ $$7 \xrightarrow{+3} 10$$ $$10 \xrightarrow{+3} 13$$Following this pattern, the next positional value will be $13 + 3 = 16$. The 16th letter of the alphabet is P.
Analyzing the Second Letter Sequence
The second letters in the series are: B, D, F, H, ?
Let's find the positional value of each letter:
- B is the 2nd letter.
- D is the 4th letter.
- F is the 6th letter.
- H is the 8th letter.
The sequence of positional values is 2, 4, 6, 8, ?. This shows a clear pattern:
$$2 \xrightarrow{+2} 4$$ $$4 \xrightarrow{+2} 6$$ $$6 \xrightarrow{+2} 8$$Following this pattern, the next positional value will be $8 + 2 = 10$. The 10th letter of the alphabet is J.
Analyzing the Third Letter Sequence
The third letters in the series are: K, L, M, N, ?
Let's find the positional value of each letter:
- K is the 11th letter.
- L is the 12th letter.
- M is the 13th letter.
- N is the 14th letter.
The sequence of positional values is 11, 12, 13, 14, ?. This shows a simple pattern:
$$11 \xrightarrow{+1} 12$$ $$12 \xrightarrow{+1} 13$$ $$13 \xrightarrow{+1} 14$$Following this pattern, the next positional value will be $14 + 1 = 15$. The 15th letter of the alphabet is O.
Combining the Results
By combining the next letters found for each position, we get the next letter cluster in the series:
- First letter: P
- Second letter: J
- Third letter: O
The next letter cluster is PJO.
Let's summarize the patterns observed:
| Position | Letters in Series | Positional Values | Pattern | Next Value | Next Letter |
|---|---|---|---|---|---|
| First | D, G, J, M, ? | 4, 7, 10, 13, ? | Add 3 | 16 | P |
| Second | B, D, F, H, ? | 2, 4, 6, 8, ? | Add 2 | 10 | J |
| Third | K, L, M, N, ? | 11, 12, 13, 14, ? | Add 1 | 15 | O |
Therefore, the letter-cluster that will replace the question mark (?) is PJO.
Revision Table: Letter Series Analysis
| Term | First Letter | Second Letter | Third Letter |
|---|---|---|---|
| 1st | D (4) | B (2) | K (11) |
| 2nd | G (7) | D (4) | L (12) |
| 3rd | J (10) | F (6) | M (13) |
| 4th | M (13) | H (8) | N (14) |
| Pattern | +3 | +2 | +1 |
| 5th (Next) | P (16) | J (10) | O (15) |
Additional Information on Letter Series Questions
Letter series questions are common in logical reasoning tests. They require you to identify a pattern in a sequence of letters or letter clusters. The patterns can be based on:
- Positional value of letters in the alphabet (e.g., +2, -3, alternating values).
- Skipping a fixed number of letters (this is equivalent to adding a fixed number to the positional value).
- Vowel/consonant patterns.
- Reversing the alphabetical order.
- Combination of multiple patterns across different positions in a cluster.
To solve these questions effectively, it's helpful to know the alphabetical position of each letter (A=1, B=2, ..., Z=26) and practice identifying different types of sequences. Writing down the positional values is often the first step to uncover numerical patterns.
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Important Questions from Alphabet Series
A series is given with some letters missing. Choose the correct alternative from the given ones that will complete the series:
BR __ __ NB __ O __ NBA series is given with some letters missing. Choose the set of letters which when sequentially placed shall complete it .
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fill in the six blanks ( _ ) using one of the following given four choices such that the series follows a specific order.
In the series AABABCABCDABCDE..., which letter appears at the 100th place?
