Give two proofs that if n is a natural number, then is odd.
(a) Use two cases.
(b) Use Exercises 7(d) and 5(h).
Reference:
7 Suppose a, b, c, and d are integers. Prove that
(d) a(a + 1) is even.
5 Let x and y be integers. Prove that
(h) if x is even and y is odd, then x + y is odd.
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