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(a) Prove that the infinite se ries 1 −1 + 1 −1 + 1 −1 + ...does not converge to any limit, using the generalization of the Weier- strass
limit found in problem 1.
(b) Criticize the following argument. The series given in part a equals zero, because addition is associative, so we can rewrite it as (1 −1) + (1 −1) + (1 −1) +
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