Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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11. Let n is a positive integer. Prove that n is even if and only if 3n²+1 is odd. (Hint: you
must prove bi-implication, it means p q = (p→q) ^ (q→ p).)
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Transcribed Image Text:11. Let n is a positive integer. Prove that n is even if and only if 3n²+1 is odd. (Hint: you must prove bi-implication, it means p q = (p→q) ^ (q→ p).)
9. Let m, n are integers. Use a proof by contraposition to prove that if m*n is even, then
m is even or n is even.
10. Let n be an integer. Use a proof by contradiction to prove that if 3n+2 is even, then
n is even.
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Transcribed Image Text:9. Let m, n are integers. Use a proof by contraposition to prove that if m*n is even, then m is even or n is even. 10. Let n be an integer. Use a proof by contradiction to prove that if 3n+2 is even, then n is even.
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