Discussion
The terms below alternate between two strands moving in opposite directions. Which term is missing?
B, Y, D, W, F, ?
Answer: D
Correct answer: U
The odd-position terms are B, D, F, climbing two at a time; the even-position terms are Y, W, and so fall two at a time. The next term belongs to the descending series, and two below W(23) is position 21, which is U. Two series moving in opposite directions is a common construction and is invisible until the terms are separated. V at 22 would be a single backward step. A quick test for two interleaved strands is to look at whether the terms alternate between two separate regions of the alphabet, as B, D, F and Y, W, U plainly do here.
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