Discussion
This sequence has been cut off before its last term. Discover the pattern and state the value the question mark conceals.
3, 88, 14, 77, 25, 66, ?
Answer: D
Correct answer: 36
Two series have been laid down alternately. The terms in the odd positions are 3, 14, 25, which rise steadily, and those in the even positions are 88, 77, 66, which fall. The missing term continues the first of these, giving 36. As a check, the answer differs from the term two places before it by 11, which is the step that strand has taken throughout. The simplest rule that fits all the terms is the intended one, and further sophistication is rarely rewarded.
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