Discussion
Every term here follows from the one before it, or from its own position. Discover the pattern and state the value the question mark conceals.
15, 17, 26, 42, 65, ?
Answer: D
Correct answer: 95
The gaps are not equal: they run 2, 9, 16, 23, each 7 more than the last. The next gap must therefore be 30, and adding it to the final term, 65 plus 30 is 95. As a check, the gap between the answer and 65 is 30, which continues the run of gaps 2, 9, 16, 23 by a further 7. The last gap is usually the largest in a growing series, which sets a lower bound on the answer.
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