Discussion
Add the alphabet positions of each neighbouring pair of terms before deciding what follows.
B, Y, E, V, H, ?
Answer: D
Correct answer: S
Each pair of adjacent terms sums to 27 in alphabet position: B(2) with Y(25), E(5) with V(22), and so H(8) must pair with position 19, which is S. Read as two strands the same thing appears - B, E, H climbing by three and Y, V falling by three. The complement-to-27 relationship is the faster check because it needs no memory of the earlier terms. The complement rule and the two-strand reading are the same fact seen from different directions, and either can be used to check the other.
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