Which one of the following is different from the others? DFH, KMO, RTV, TWZ

The correct answer is C. TWZ is the odd one out.

Convert each letter to its alphabetical position (A=1 to Z=26) and look at the gaps. In DFH, D(4), F(6), H(8) rises by +2 each step. In KMO, K(11), M(13), O(15) also rises by +2. In RTV, R(18), T(20), V(22) rises by +2 throughout. TWZ breaks the pattern: T(20), W(23), Z(26) rises by +3 each step.

• A) KMO follows the +2 pattern, so it belongs with the group.
• B) RTV also moves in steps of two, so it is not the odd one.
• D) DFH is a clean +2 sequence as well.

The core concept is alphabetical positional value, the basis of letter-series and coding-decoding questions in the reasoning portion of UPPSC prelims. These questions reward quick letter-to-number conversion and the habit of testing a constant difference across all three letters.

Trap: Aspirants often check only the first two letters of a group, or assume every group must share the same gap. Compute all three positions before you decide.