Arithmetic Sequences and Series Exam Questions for IB HL and SL Students

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I agree that these could be SL questions but they are all from HL past papers. November 2009 HL and May/November 2008 HL papers.

andrewchambers
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i dont understand the last question, it says the areas are in an arithmetic series, not the angles. So Sn= pi r^2 No?
Pleas enlighten me, i have a test tomorow

mroliver