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Exam (elaborations)

COS3761 EXAM PACK

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2021/2022 Written for academic year
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University Of South Africa (Unisa)
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COS3761 - Formal Logic III (COS3761)
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COS3761 EXAM PACK

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EXAMINATION PACK

COS3761
PAST PAPER SOLUTIONS AND NOTES




1

, Content page

Contents
EXAMINATION PACK ................................................................................................... 1

Content page .................................................................................................................. 2

1. OCT/NOV 2019 .................................................................................................... 3

2. MAY/JUNE 2019................................................................................................. 11

3. OCT/NOV 2018 .................................................................................................. 18




2

, 1. OCT/NOV 2019




¬(𝑟 → ¬𝑞)




If Bob has a fever and it is raining then Solomon is dancing




1 𝑝→𝑞 Premise
2 ¬𝑝 → 𝑟 Premise
3 ¬𝑞 → ¬𝑟 Premise
4 ¬𝑞 Assumption
5 ¬𝑟 → 𝑒𝑙𝑖𝑚 3, 4
6 ¬𝑝 𝑀𝑇 1, 4
7 𝑟 → 𝑒𝑙𝑖𝑚 2, 6
8 ⊥ ¬𝑒𝑙𝑖𝑚 5,7
9 𝑞 PBC 4-8

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