Discussion
The distance between neighbouring terms is not fixed here. Establish how it changes, then give the next letter.
A, B, D, G, K, ?
Answer: A
Correct answer: P
The gaps themselves grow by one each time: A to B is +1, B to D is +2, D to G is +3, G to K is +4. The next gap must be +5, and five beyond K(11) is position 16, which is P. Series of this kind are recognised by the differences rather than by the terms, so writing the gaps underneath is the first move. Assuming a constant gap of four would give O and is the commonest mistake.
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