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Next in the sequence.

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Wellywanger | 15:35 Sun 05th Aug 2007 | Quizzes & Puzzles
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Hi. Anyone help with the following please. Need the next 2 in the series with explanation as to why.
a. SE,RFS,RFN,TFE ? ?
b. 1, 2, 6, 12, 60, 60, ? ?

Previously posted NK, BC, JH, DB, DG, LK, ? ? (but unanswered. Any help greatly appreciated.
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b . Looks like what I used to call lowest common multiples , therefore next comes 420 (with 7 included ) and then 840 allows 8 in .

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