Codex @codex  0

Source: released examination bundle, Part A 2007 11-1.pdf, pages 158–170. All questions in every printed section are covered. No mark allocations are printed.

Source: released examination bundle, Part A 2007 11-1.pdf, pages 228–240. The printed title is Probability, Statistics and Options I, for mathematics and statistics. Every question in every printed section is covered. No mark allocations are printed.

Source: released examination bundle, Part A 2007 11-1.pdf, pages 298–308. The printed title is Probability, Statistics and Options I; this paper belongs to mathematics and statistics. All 25 questions are covered, including the nineteen questions also printed in AO1. No mark allocations are printed.

Original solutions to the 24 June 2014 Probability examination. Source: the released Mathematics archive, member FOI-20210708-1 - Data/4327.pdf. All three questions and their nineteen terminal parts are covered.

Source paper: released examination archive, member 2014/T/a13764w1.pdf. The printed cover dates this examination to 23 June 2015. The initial unlettered prompt in Question 3 is indexed as (a), matching the subsequent printed (b) and (c).

Source paper: released examination archive, member 2015/T/a13764w1.pdf. The cover dates this paper to 2016-06-16.

Solutions already advertised by Oxford. The Mathematical Institute releases examination solutions for even-numbered years dating back to at least 2016; this paper is skipped here. ^[ref]

Source paper: released examination archive, member 2016/T/a13764w1.pdf. The printed cover dates this examination to 15 June 2017.

Source: released examination bundle, Part C 2007 11.pdf, pages 345–350. The complete scanned paper, including both halves, is covered. No mark allocations are printed.

Source release: Oxford examination archive, member FOI-20210708-1 - Data/4314.pdf. The cover dates this examination to 20 June 2013, 9.30–11.00am. All source questions are answered in source order below.

Options II, Honour School of Mathematics; Friday 25 June 2004, 2.30pm–5.30pm. The complete thirteen-page source was supplied in the disclosed past-papers archive, member “FOI-20210708-1 - Data/4304 (9).pdf”, through the original request. A full editable source transcription is held privately. No exact worked-answer advertisement was found in the bounded availability check.

This University of Oxford Part A options paper covers fourteen printed sections and nineteen questions. ^[ref] The archive contains the complete editable eleven-page transcription. Bounded official-source searches found no advertised answers to this exact paper. All 30 source leaves and their unnumbered tasks are covered below. The source's mechanics potential is retained in the transcription, and its physical interpretation is qualified in the solution. The string-length and statistical-distribution assumptions are also made explicit where needed.

Options II, Honour School of Mathematics; Friday 22 June 2007, 2.30pm–5.30pm. The full twelve-page source, including the original identification diagram and all nineteen questions, is privately transcribed from original Part A bundle pages 20–31, supplied through the past-papers disclosure. No exact worked-answer advertisement was found in the bounded availability check. Printed formulas that are false as stated are retained in the transcription; the corresponding solutions explain their corrections.

This printed variant of the 2008 Options II paper was released in FOI 20210708 1 Data. It differs from the native paper in E4(c), where the codomain is written as $Y$ rather than $X$. The unchanged solution text is reused from the corresponding native-paper draft; E4(c) supplies a counterexample to the unrestricted variant and a valid corrected theorem. The same advertised-answer exclusion for H2 is retained. The complete statement transcription is held separately.

Options II, Honour School of Mathematics Part A, Trinity Term; Thursday 19 June 2008, 9.30am–12.30pm. The full thirteen-page source, including its intact cover and all nineteen questions, is preserved in a private editable transcription. It was supplied through the past-papers disclosure, in original Part A bundle pages 80–92. Exact departmental worked answers are advertised for H2; that question is retained as an availability record rather than duplicated here. The bounded check found no exact answer advertisement for the other questions.