Discussion
Work out the spacing within a pair and the spacing between pairs, then name the pair that follows.
BD, FH, JL, NP, ?
Answer: D
Correct answer: RT
Each pair holds two letters two places apart, and successive pairs begin four places apart: B, F, J, N. The next begins at R, giving RT. Writing the starting letters alone - B, F, J, N, R - makes the outer pattern obvious and reduces the problem to reproducing the internal gap. RS narrows that gap to one and is the usual error. Every letter used lies at an even position, so the whole series is drawn from the same half of the alphabet, which is a useful check on any candidate answer.
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