Discussion
Every adjacent pair of these letters shares a constant property. Use it to find the missing term.
D, W, F, U, H, ?
Answer: A
Correct answer: S
The terms pair off to a constant sum: D(4) and W(23) make 27, F(6) and U(21) make 27, so H(8) must be followed by position 19, which is S. Equivalently, the odd-position terms climb by two and the even-position terms fall by two. Both readings give the same answer, and agreement between two methods is the best check available on a series question. Because each adjacent pair sums to 27, the answer can be found from the immediately preceding term alone, without reconstructing the whole series.
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