Discussion
Both the pairs and the letters within them descend. Supply the pair that completes the run.
ZY, XW, VU, TS, ?
Answer: A
Correct answer: RQ
The pairs run backwards through the alphabet, two letters at a time, with each pair written in descending order: Z and Y, then X and W, then V and U, then T and S. The next pair is R and Q, giving RQ. Both the direction of the series and the order within each pair are descending, and keeping the two consistent is where the errors arise. Everything descends here, both within each pair and between pairs, so listing the leading letters Z, X, V, T and R first is the safest route.
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