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Let P(n) be the statement that sum l = 1 to n (i – 2) * (i + 2) = (n(n + 1)(2n + 1))/6 – 4n
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Let P(n) be the statement that sum l = 1 to n (i – 2) * (i + 2) = (n(n + 1)(2n + 1))/6 – 4n
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