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Billy Reid S

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TOMMO33 | 17:50 Sun 17th May 2009 | Quizzes & Puzzles
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Hallo, Billy Reid S, if you're out there somewhere. Are you able to say what the next term was, and why, in the series that you gave that your grandson reckoned he arrived at in less than 20 seconds?
The series was 1-6-15-20-350-4500-?
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