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Which one of the numbers does not belong in the following series?

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Brackenheart | 17:57 Tue 01st Feb 2011 | Quizzes & Puzzles
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2, 3, 6, 7, 8, 14, 15, 30
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8. You add one to the previous number and then multiply by two.
8. Add each pair together +1 to get the next one
so in answer to your question 8 is the one which does not belong
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Thanks to you all!

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Which one of the numbers does not belong in the following series?

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