Discussion
One number has been withheld from the end of this sequence. Discover the pattern and state the value the question mark conceals.
20, 26, 35, 47, 62, ?
Answer: B
Correct answer: 80
The gaps are not equal: they run 6, 9, 12, 15, each 3 more than the last. The next gap must therefore be 18, and adding it to the final term, 62 plus 18 is 80. As a check, the gap between the answer and 62 is 18, which continues the run of gaps 6, 9, 12, 15 by a further 3. A series may be read as a formula in the position or as a step from the previous term, and the two views agree.
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