Discussion
One strand of this run climbs from the start of the alphabet and another falls from its end. What follows?
Z, A, Y, B, X, ?
Answer: B
Correct answer: C
One strand runs Z, Y, X, moving backwards from the end of the alphabet; the other runs A, B, moving forwards from the start. The next term belongs to the forward strand and is C. The two strands are converging towards the middle, which is the signature of this construction. W continues the backward strand and is the answer if the alternation is missed. Series in which one strand climbs from A while another falls from Z will meet in the middle, so they cannot run for more than thirteen terms.
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