Prove that the sum of an even integer and an odd integer is odd. Let n₁ be an even integer, and let n₂ be an odd integer. So n₁ = n₁ + n₂ = + 1 = for some integer k₂ and n₂ = (K₁ + K₂) + 1 is -Select-- for some integer k₂. Then

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