Discussion
The numbers below were generated by a rule that holds throughout. Establish what governs the terms and give the one that comes next.
60, 53, 46, 39, 32, ?
Answer: A
Correct answer: 25
Every gap is the same: the differences run -7, -7, -7, -7, so the common difference is -7. Applying it once more to the final term, 32 - 7 gives 25. As a check, subtracting -7 from the answer returns 32, the term before it, and repeating that recovers the whole series. The number of terms shown is chosen so that the rule is determined; with one fewer, more than one answer would fit.
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