Consider the following argument. If I get a Christmas bonus, I'll buy a stereo. If I sell my motorcycle, I'll buy a stereo. :. If I get a Christmas bonus or I sell my motorcycle, then I'll buy a stereo. Let p = "if I get a Christmas bonus," q = "if I sell my motorcycle," and r = "I'll buy a stereo." Is the argument valid or invalid? Select the answer that shows the symbolic form of the argument and justifies your conclusion. O form: r→q invalid, converse error r-p ar-pvq form: →q valid, proof by division into cases r-p :r-pvq form: pr valid, proof by division into cases q→r :pvq→r form: prinvalid, converse error 9-r :pva-r O form: rq invalid, inverse error r-p :r-pvq

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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**Consider the following argument.**

If I get a Christmas bonus, I'll buy a stereo.  
If I sell my motorcycle, I'll buy a stereo.  
∴ If I get a Christmas bonus or I sell my motorcycle, then I'll buy a stereo.  

Let \( p \) = "if I get a Christmas bonus," \( q \) = "if I sell my motorcycle," and \( r \) = "I'll buy a stereo."

**Is the argument valid or invalid? Select the answer that shows the symbolic form of the argument and justifies your conclusion.**

- \( \circ \) form: \( r \rightarrow q \) invalid, converse error  
  \( r \rightarrow p \)  
  ∴ \( r \rightarrow p \lor q \)  

- \( \circ \) form: \( r \rightarrow q \) valid, proof by division into cases  
  \( r \rightarrow p \)  
  ∴ \( r \rightarrow p \lor q \)  

- \( \circ \) form: \( p \rightarrow r \) valid, proof by division into cases  
  \( q \rightarrow r \)  
  ∴ \( p \lor q \rightarrow r \)  

- \( \circ \) form: \( p \rightarrow r \) invalid, converse error  
  \( q \rightarrow r \)  
  ∴ \( p \lor q \rightarrow r \)  

- \( \circ \) form: \( r \rightarrow q \) invalid, inverse error  
  \( r \rightarrow p \)  
  ∴ \( r \rightarrow p \lor q \)
Transcribed Image Text:**Consider the following argument.** If I get a Christmas bonus, I'll buy a stereo. If I sell my motorcycle, I'll buy a stereo. ∴ If I get a Christmas bonus or I sell my motorcycle, then I'll buy a stereo. Let \( p \) = "if I get a Christmas bonus," \( q \) = "if I sell my motorcycle," and \( r \) = "I'll buy a stereo." **Is the argument valid or invalid? Select the answer that shows the symbolic form of the argument and justifies your conclusion.** - \( \circ \) form: \( r \rightarrow q \) invalid, converse error \( r \rightarrow p \) ∴ \( r \rightarrow p \lor q \) - \( \circ \) form: \( r \rightarrow q \) valid, proof by division into cases \( r \rightarrow p \) ∴ \( r \rightarrow p \lor q \) - \( \circ \) form: \( p \rightarrow r \) valid, proof by division into cases \( q \rightarrow r \) ∴ \( p \lor q \rightarrow r \) - \( \circ \) form: \( p \rightarrow r \) invalid, converse error \( q \rightarrow r \) ∴ \( p \lor q \rightarrow r \) - \( \circ \) form: \( r \rightarrow q \) invalid, inverse error \( r \rightarrow p \) ∴ \( r \rightarrow p \lor q \)
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