20. Let
be an alternating series for which each an > 0 and the limit of an as n goes to infinity is equal to zero. Which of the following conditions is sufficient to guarantee that S converges?
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A.
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B.
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C.
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D.
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E.
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Solution: The answer is B
If S is an alternating series for which each an > 0 and the limit of an as n goes to infinity is equal to zero. Then by the Alternating Series Test the only other condition required to guarantee that S converges is that,
