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1st/2ways: add math sum a + (a+d) + (a+2d) + ... + (a+(n-1)d) ?

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Prove Σ1/((k-1)(k+1))=(3n^2-n-2)/(4n(n+1)) where k=2 to n ∀n ≥ 2
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Prove Σ1/((k-1)(k+1))=(3n^2-n-2)/(4n(n+1)) where k=2 to n ∀n ≥ 2

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2 ways: integral ∫x/(x+a) dx

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What would the value of SS be for his set of scores [118,118,118,118,118,118]?
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What would the value of SS be for his set of scores [118,118,118,118,118,118]?

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