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7 9 66 12 14 66 17 choose which pair of...

This question belongs to Competitive Reasoning Number Series Completion
Number Series Completion
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7, 9, 66, 12, 14, 66, 17, ... choose which pair of numbers comes next?

Answer & Solution
Correct Answer: Option A
This is an alternating addition series with repetition, in which a random number, 66, is interpolated as every third number. The regular series adds 2, then 3, then 2, and so on, with 66 repeated after each "add 2" step.
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