Discussion
The sequence below breaks off before its final term. Work out the rule and supply the missing number.
4, 17, 30, 43, ?
Answer: C
Correct answer: 56
Every gap is the same: the differences run 13, 13, 13, so the common difference is 13. Applying it once more to the final term, 43 + 13 gives 56. As a check, subtracting 13 from the answer returns 43, the term before it, and repeating that recovers the whole series. The distractors here sit one step either side of the answer, which is what a miscount of a single term produces.
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