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Disprove by counterexample each of these conjectures A. All mammals are vegetarians. B. Every geometric figure with four right angles is a square. C. If a real number is not positive, then it must be negative. D. If one of two numbers is even, then the sum of those two numbers is even.

Disprove by counterexample each of these conjectures A. All mammals are vegetarians. B. Every geometric figure with four right angles is a square. C. If a real number is not positive, then it must be negative. D. If one of two numbers is even, then the sum of those two numbers is even.

Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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1. Disprove by counterexample each of these conjectures A. All mammals are vegetarians. B. Every geometric figure with four right angles is a square. C. If a real number is not positive, then it must be negative. D. If one of two numbers is even, then the sum of those two numbers is even.
Transcribed Image Text:1. Disprove by counterexample each of these conjectures A. All mammals are vegetarians. B. Every geometric figure with four right angles is a square. C. If a real number is not positive, then it must be negative. D. If one of two numbers is even, then the sum of those two numbers is even.
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