Suppose that Σ an = -3 and n=] ∞ A. Σ(-6an + −8bn) n=1 = B. (-6an +-8bn) n=2 = ∞ n=1 bn = -5 and a1 = = 6 and b₁ = 1, find the sum of the series:

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A: Given,

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A: Solution: The series is ∑n=1∞-1n-1n2 Actual value is ∑n=1∞-1n-1n2≈0.822

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