Discussion
Each number here is twice the one before it. Supply the term that completes the run.
A5, B10, C20, D40, ?
Answer: C
Correct answer: E80
The letters climb one place at a time and the numbers double: 5, 10, 20, 40. Twice 40 is 80, so the term is E80. E60 treats the numbers as growing by a constant 20, which fits only the last step; the earlier steps of 5 and 10 rule it out immediately, which is why every gap should be checked rather than just the most recent. Doubling and adding a constant agree at one step and diverge at every other, so a rule should always be tested against the first pair as well as the last.
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