Discussion
The numbers below advance according to a pattern you are asked to identify. Establish what governs the terms and give the one that comes next.
1, 100, 5, 90, 9, 80, ?
Answer: A
Correct answer: 13
Two series have been laid down alternately. The terms in the odd positions are 1, 5, 9, which rise steadily, and those in the even positions are 100, 90, 80, which fall. The missing term continues the first of these, giving 13. As a check, the answer differs from the term two places before it by 4, which is the step that strand has taken throughout. Separating the odd and even positions turns one confusing series into two simple ones.
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