In the following alphabet pattern question, four groups of four letters each are given: FUGT, KPLO, DWEV and CWDX. In three of these groups, both the first and third letters and the second and fourth letters form specific patterns of consecutive letters, while one group breaks this regular pattern. Select the odd letter group from the given alternatives.

Introduction / Context:
This question tests your skill in recognising structured patterns within groups of letters. You are given four letter groups: FUGT, KPLO, DWEV and CWDX. In many reasoning questions with such groups, the letters form pairs that are consecutive in the alphabet, either in forward or in reverse order. Here, all four groups have their first and third letters consecutive in forward order, but three groups also have the second and fourth letters consecutive in reverse order. One group has the second and fourth letters consecutive in forward order instead, making it the odd one out.

Given Data / Assumptions:

• Letter groups: FUGT, KPLO, DWEV and CWDX.
• Alphabet positions: A = 1, B = 2, ..., Z = 26.
• In each group, we examine positions 1 and 3 as one pair, and positions 2 and 4 as another pair.
• In three groups, both pairs show the same direction pattern (first and third forward, second and fourth backward).
• In one group, the second and fourth letters move in a different direction, breaking the pattern.

Concept / Approach:
We convert each letter to its numerical alphabet position and then examine whether certain pairs are consecutive. In all four groups, letters at positions 1 and 3 are consecutive in forward order: first letter plus one gives the third letter. For the second and fourth letters, however, three groups show a backward consecutive pair (second letter minus one equals fourth letter), while one group shows a forward consecutive pair (second letter plus one equals fourth letter). This difference in direction makes that group the odd one out.

Step-by-Step Solution:
Step 1: Analyse FUGT.F = 6, U = 21, G = 7, T = 20.First and third letters: F (6) and G (7) are consecutive in forward order.Second and fourth letters: U (21) and T (20) are consecutive in reverse order.Step 2: Analyse KPLO.K = 11, P = 16, L = 12, O = 15.First and third letters: K (11) and L (12) are consecutive forward.Second and fourth letters: P (16) and O (15) are consecutive backward.Step 3: Analyse DWEV.D = 4, W = 23, E = 5, V = 22.First and third letters: D (4) and E (5) are consecutive forward.Second and fourth letters: W (23) and V (22) are consecutive backward.Step 4: Analyse CWDX.C = 3, W = 23, D = 4, X = 24.First and third letters: C (3) and D (4) are consecutive forward.Second and fourth letters: W (23) and X (24) are consecutive forward, not backward.Step 5: Identify the odd group.In FUGT, KPLO and DWEV, second and fourth letters are consecutive in reverse order, but in CWDX they are consecutive in forward order. Therefore CWDX is the odd group.

Verification / Alternative check:
A simple visual check is to underline the 1st and 3rd letters and then the 2nd and 4th letters in each group. For all four groups, the 1st and 3rd letters (F and G, K and L, D and E, C and D) move forward by one letter. For FUGT, KPLO and DWEV, the 2nd and 4th letters (U and T, P and O, W and V) move backward by one letter. Only in CWDX do the 2nd and 4th letters (W and X) move forward by one letter. This visual approach confirms that CWDX does not share the same direction pattern.

Why Other Options Are Wrong:
FUGT: F and G are forward consecutive; U and T are backward consecutive, so it follows the main design.
KPLO: K and L are forward consecutive; P and O are backward consecutive, again matching the pattern.
DWEV: D and E are forward consecutive; W and V are backward consecutive, so it is not the odd one.

Common Pitfalls:
Students sometimes check only one pair of letters (for example, the first and third) and conclude that all groups are similar, missing the more subtle pattern in the second and fourth letters. In advanced alphabet pattern questions, it is essential to examine all possible letter relationships inside each group rather than stopping after noticing the first similarity. Being systematic about pairs of positions greatly improves accuracy in such puzzles.

Final Answer:
The odd letter group is CWDX, because in this group both pairs of letters move forward, whereas in the other three groups the first and third letters move forward but the second and fourth letters move backward by one position.