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wrong number

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balooney | 16:14 Wed 12th Oct 2011 | Quizzes & Puzzles
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one number is wrong in the following series 3,4,6,9,13 17 what should that number be?
any ideas would be helpful
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the wrong number is 17.

3 plus 1 is 4, plus 2 makes 6, plus 3 makes 9, plus 4 makes 13 so it should then be plus 5 makes 18 not 17.

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