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what comes next

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canlock | 22:02 Mon 13th Jul 2009 | Quizzes & Puzzles
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1220

u(n) = 3*u(n-1) - 10
1220,the difference multiplied by 3.
1220(add30 add90 add270 add810) I think if my maths is right
1220 worked it out the same way as spodo commodo
wow is this HGFSA already?

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