2. (a) Use a prove by contradiction to show that if a and b are nonzero integers such that a divides b and a + b is odd,
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2. (a) Use a prove by contradiction to show that if a and b are nonzero integers such that a divides b and a + b is odd,
2. (a) Use a prove by contradiction to show that if a and b are nonzero integers such that a divides b and a + b is odd, then a is odd. (b) Prove that if n is a positive integer, then n? #2(mod 4).
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