Discussion
Each of the terms below stands in a fixed relation to its neighbours. Discover the pattern and state the value the question mark conceals.
2, 70, 10, 63, 18, 56, ?
Answer: D
Correct answer: 26
Two series have been laid down alternately. The terms in the odd positions are 2, 10, 18, which rise steadily, and those in the even positions are 70, 63, 56, which fall. The missing term continues the first of these, giving 26. As a check, the answer differs from the term two places before it by 8, which is the step that strand has taken throughout. Any series can be checked by generating it afresh from the identified rule and comparing term by term.
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