Discussion
These terms descend, and each number restates its letter. Which term belongs at the question mark?
Y25, W23, U21, S19, ?
Answer: A
Correct answer: Q17
Each term is a letter with its alphabet position, and the letters descend two places at a time: Y(25), W(23), U(21), S(19). The next letter is Q at position 17, so the term is Q17. The numbers falling by two follows automatically from the letters, so there is only one series here despite the appearance of two. Because the number restates the letter's position, only one of the four options can be internally consistent, which narrows the field before the pattern is even considered.
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