Let and be statements. Which of the following strategies is not a valid way to show that ‘ implies ’?
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JNU SSS 2015 Question 61: Logic and proof techniques
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Let X and Y be statements. Which of the following strategies is not a valid way to show that ‘ X implies Y ’? (A) Assume that Y is false, and then use this to show that X is false (B) Show that some statement Z implies Y, and then show that X implies Z (C) Show that either X is false, or Y is true, or both (D) Assume that X is false, and Y is true, and deduce a contradiction
Logic and proof techniques has come up 73 times in 3 exams since 2004.
What this question tests
This question is on Proof techniques, part of Logic and proof techniques in Mathematics.
The standard ways to prove or disprove a claim.
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Question from the JNU SSS 2015 paper. Solutions are TestStop's own. Not affiliated with or endorsed by any examination authority.