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20 20 17 17 14 14 11 choose which pair of...

This question belongs to Competitive Reasoning Number Series Completion
Number Series Completion
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20, 20, 17, 17, 14, 14, 11, ... choose which pair of numbers comes next?

Answer & Solution
Correct Answer: Option E
This is a simple subtraction with repetition series. It begins with 20, which is repeated, then 3 is subtracted, resulting in 17, which is repeated, and so on.
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