Discussion
Two different step lengths are used in turn here. Which letter belongs at the question mark?
B, D, G, I, L, ?
Answer: A
Correct answer: N
The differences alternate between two and three: B(2) to D(4), D to G(7), G to I(9), I to L(12). The next difference is +2, taking the series to position 14, which is N. Because the gaps repeat in pairs, the terms advance five places for every two steps, which is a quick way to check a long series of this kind without listing every term. The terms at the odd positions are B, G and L, five apart, which gives a quick independent check on any answer proposed.
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