| Exam Board | OCR |
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| Module | Further Pure Core 1 (Further Pure Core 1) |
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| Year | 2021 |
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| Session | November |
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| Topic | Sequences and series, recurrence and convergence |
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10 Using an algebraic method, determine the least value of \(n\) for which \(\sum _ { r = 1 } ^ { n } \frac { 1 } { ( 2 r - 1 ) ( 2 r + 1 ) } \geqslant 0.49\).