Discussion
The gaps in this run alternate between two sizes. Establish the order and name the missing letter.
A, C, F, H, K, ?
Answer: D
Correct answer: M
The gaps alternate: A to C is +2, C to F is +3, F to H is +2, H to K is +3. The next gap returns to +2, and two beyond K(11) is position 13, which is M. Alternating gaps are read by writing the differences underneath and looking for the repeat; assuming a single constant gap gives either L or N depending on which of the two steps is chosen. Alternating gaps advance the series five places for every two terms, so the odd-position terms A, F and K form a five-step series of their own.
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