Which letter trio does NOT follow the ascending order? ABC, BCD, CDE, DFE, EFG
DFE
Checking each trio for the alphabetical step between consecutive letters: ABC moves A→B→C, each step forward by 1 letter.
BCD, CDE, and EFG also each move forward by exactly 1 letter between every pair of consecutive letters.
DFE moves D→F (a jump of 2 letters) and then F→E (a step backward by 1 letter), so it does not rise in a steady ascending order like the others.
Hence, the answer is DFE.
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