Discussion
This sequence has been cut off before its last term. Establish what governs the terms and give the one that comes next.
41, 56, 71, 86, ?
Answer: D
Correct answer: 101
Every gap is the same: the differences run 15, 15, 15, so the common difference is 15. Applying it once more to the final term, 86 + 15 gives 101. As a check, subtracting 15 from the answer returns 86, the term before it, and repeating that recovers the whole series. When a rule fits every gap but one, the exception is usually the reader's arithmetic rather than the series.
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