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Alphabetic sequence with fixed middle: extend QAR, RAS, SAT, TAU, ____ by advancing the first and last letters by +1 while keeping the central 'A' unchanged.

Difficulty: Easy

Correct Answer: UAV

Explanation:

The form is (Letter, 'A', Letter) with +1 steps on the outer letters.

  • First letters: Q → R → S → T → U (+1).
  • Second letters: constant 'A'.
  • Third letters: R → S → T → U → V (+1).

Concept/Approach
Hold the middle fixed; treat the ends as synchronized forward progressions.
Step-by-Step calculation
After TAU, increment first and last: T→U, U→VUAV.
Verification/Alternative
Check neighbors: SAT → TAU → UAV confirms steady +1 on the ends.
Common pitfalls
Altering the middle 'A' or reversing the direction on one side.
Final Answer
UAV
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