Discussion
In the terms below the letters retreat while the numbers advance. Which term comes fifth?
Z2, X4, V6, T8, ?
Answer: C
Correct answer: R10
The letters descend two places at a time from the end of the alphabet - Z(26), X(24), V(22), T(20) - while the numbers climb by two. The next letter is R at position 18 and the next number is 10, giving R10. Letters falling while numbers rise is a deliberate distraction; separating the strands makes both trivial. S at 19 would be a single backward step. The letters and numbers move in opposite directions but at the same rate, so the sum of the letter's position and the number stays constant at 28 throughout.
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