Discussion
A single relationship connects every term shown here. Find the rule and name the term that completes the run.
11, 25, 39, 53, ?
Answer: D
Correct answer: 67
Every gap is the same: the differences run 14, 14, 14, so the common difference is 14. Applying it once more to the final term, 53 + 14 gives 67. As a check, subtracting 14 from the answer returns 53, the term before it, and repeating that recovers the whole series. The last term is the one most often misread, and re-checking it costs nothing.
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