Study the letter series and choose the missing term: IAZ, KEB, ?, OOF, QUH
2014
Study the letter series and choose the missing term: IAZ, KEB, ?, OOF, QUH
Answer: D. MID — ConceptIn a fixed-length letter series, read each character position as a separate column. A column may follow a constant alphabet shift, cyclic wrapping…
- A.
MDD
- B.
MII
- C.
MIO
- D.
MID
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Show answer & explanation
Correct answer: D
Concept
In a fixed-length letter series, read each character position as a separate column. A column may follow a constant alphabet shift, cyclic wrapping after Z, or an ordered category such as the vowels.
Test the same rule on both sides of the blank. Do not force a constant numerical jump where the letters instead form a familiar ordered set.
Application
First position: I, K, ?, O, Q advances by two alphabet places each time. The missing first letter is M.
Middle position: A, E, ?, O, U is the vowel sequence A, E, I, O, U. The missing middle letter is I; this is a vowel-order rule, not a constant +4 shift.
Third position: Z, B, ?, F, H advances by two alphabet places with wraparound after Z. The missing third letter is D.
Cross-check
Position | Completed column | Rule |
|---|---|---|
First | I, K, M, O, Q | +2 alphabet places |
Middle | A, E, I, O, U | Vowels in order |
Third | Z, B, D, F, H | +2 with wraparound |
Contrast
MDD places D in the middle, outside the ordered vowel column A, E, I, O, U.
MII places I in the third column, interrupting the cyclic Z, B, D, F, H progression.
MIO places O in the third column, which also interrupts the cyclic two-letter progression.
MID supplies M, I, and D, completing all three independent columns.
Result
Therefore, the missing term is MID.
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