Discussion
This run descends using two step lengths in turn. Give the letter that comes next.
Z, X, U, S, P, ?
Answer: C
Correct answer: N
The series falls, alternating -2 and -3: Z(26), X(24), U(21), S(19), P(16). The next step is -2, giving position 14, which is N. Backwards alternating gaps are the most error-prone of these constructions, and converting every term to its position before subtracting is the only reliable method. O at 15 is a single backward step. Descending alternating gaps are the most error-prone construction in this topic, and converting every term to its position before subtracting is the only dependable method.
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