Discussion
Each letter here stands the same distance from its neighbour. Which letter belongs where the question mark is?
B, D, F, H, ?
Answer: D
Correct answer: J
Every letter is two places further on than the one before it: B to D, D to F, F to H. Two places past H is J. The series is simply the even-numbered letters of the alphabet - positions 2, 4, 6, 8, 10. The trap is I, which is the very next letter but only one step on; the gap here has been two throughout and there is nothing in the series to suggest it changes. Series built on a single constant gap are the foundation of this topic, and every harder pattern here is a variation on one: alternating gaps, growing gaps, or two such series interleaved.
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