| Exam Board | OCR MEI |
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| Module | C2 (Core Mathematics 2) |
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| Year | 2005 |
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| Session | January |
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| Topic | Geometric Sequences and Series |
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5 The first three terms of a geometric progression are 4, 2, 1.
Find the twentieth term, expressing your answer as a power of 2.
Find also the sum to infinity of this progression.