Discussion
The terms shown are enough to fix the rule and so the term that follows. Discover the pattern and state the value the question mark conceals.
6, 55, 9, 50, 12, 45, ?
Answer: C
Correct answer: 15
Two series have been laid down alternately. The terms in the odd positions are 6, 9, 12, which rise steadily, and those in the even positions are 55, 50, 45, which fall. The missing term continues the first of these, giving 15. As a check, the answer differs from the term two places before it by 3, which is the step that strand has taken throughout. Where two adjacent terms share a factor, that factor often appears in the rule itself.
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