Let S(n) = 1 + 2 + + n be the sum of the
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Let S(n) = 1 + 2 + · · · + n be the sum of the first n natural numbers and let C(n) = 13 + 23 + · · · + n3 be the sum of the first n cubes. Prove the following equalities by induction on n, to arrive at the curious conclusion that C(n) = S2(n) for every n.
a. S(n) = 1/2n(n + 1).
b. C(n) = 1/4 (n4 + 2n3 + n2) = 1/4n2(n + 1)2.
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