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QLDPhilosophy and ReasonQuick questions
Unit 3: Reason and formal logic
Quick questions on Propositional logic and truth tables: QCE Philosophy and Reason
6short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What are symbolising propositions?Show answer
A proposition is a statement that is true or false. We assign capital letters (P, Q, R) to simple propositions and combine them with logical operators (connectives):
What is the truth tables for each operator?Show answer
Each operator is defined entirely by how it maps the truth values of its parts. With T for true and F for false:
What is testing an argument for validity?Show answer
An argument is valid if there is no row where every premise is true and the conclusion is false. Method:
What is q1?Show answer
Give the truth table for the conditional "if P then Q" and explain when it is false. [3 marks]
What is q2?Show answer
Symbolise: "You will pass only if you study." [2 marks]
What is q3?Show answer
Use a truth table to test "P or Q; not-P; therefore Q" (disjunctive syllogism). [4 marks]
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