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4. 5. 6. For every two sets A and B, (AUB)-B = A. There exists an odd integer, the sum of whose digits is odd, and the product of whose digits is even. There exist odd integers x and y such that x ‡ y and 7 1 x² + 3y²

4. 5. 6. For every two sets A and B, (AUB)-B = A. There exists an odd integer, the sum of whose digits is odd, and the product of whose digits is even. There exist odd integers x and y such that x ‡ y and 7 1 x² + 3y²

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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Give formal well-written proofs when you are proving a result or a counter example otherwise

Prove or disprove each of the following statements

4. 5. 6. For every two sets A and B, (AUB)-B = A. There exists an odd integer, the sum of whose digits is odd, and the product of whose digits is even. There exist odd integers x and y such that x ‡ y and 7 1 x² + 3y²
Transcribed Image Text:4. 5. 6. For every two sets A and B, (AUB)-B = A. There exists an odd integer, the sum of whose digits is odd, and the product of whose digits is even. There exist odd integers x and y such that x ‡ y and 7 1 x² + 3y²
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