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The steps here are not all the same size, though they repeat. Which letter follows the five shown?
F, H, K, M, P, ?

  • A.Q
  • B.R
  • C.S
  • D.O

Answer: A

Correct answer: R

The differences run +2, +3, +2, +3 from F(6): H(8), K(11), M(13), P(16). The next difference is +2, giving position 18, which is R. As with the others of this family the alternation must be established from at least three gaps before it can be trusted, since two gaps alone are consistent with several rules. Establishing an alternation needs at least three gaps, since two are consistent with several different rules and give no way to choose between them.

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