Discussion
The terms below were produced by applying the same operation repeatedly. Discover the pattern and state the value the question mark conceals.
1, 4, 14, 31, 55, ?
Answer: A
Correct answer: 86
The gaps are not equal: they run 3, 10, 17, 24, each 7 more than the last. The next gap must therefore be 31, and adding it to the final term, 55 plus 31 is 86. As a check, the gap between the answer and 55 is 31, which continues the run of gaps 3, 10, 17, 24 by a further 7. The rule should account for every term shown, not merely the last two.
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