| Exam Board | OCR MEI |
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| Module | Paper 3 (Paper 3) |
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| Year | 2018 |
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| Session | June |
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| Topic | Proof |
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12 Lines 5 and 6 outline the stages in a proof that \(\frac { a + b } { 2 } \geqslant \sqrt { a b }\). Starting from \(( a - b ) ^ { 2 } \geqslant 0\), give a detailed proof of the inequality of arithmetic and geometric means.