Discussion
The alphabet positions of these four letters form a familiar numerical pattern. Which letter comes fifth?
A, D, I, P, ?
Answer: D
Correct answer: Y
The positions are 1, 4, 9, 16 - the perfect squares. The next square is 25, and position 25 is Y. Reading this as a letter series with growing gaps also works, since the differences are 3, 5, 7 and then 9, but recognising the squares is quicker and leaves no room for a miscount. Z at 26 is the natural guess for anyone who assumes the series ends at the alphabet's close. Squares grow quickly, so a series of this shape gives at most five terms before it passes Z, and recognising that limit is often enough to identify the rule.
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