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2. Let S: (-1) (1 -2) InEN Determine sup S and inf S. Solution. As for every n E N we have (-1) (1- -

2. Let S: (-1)" (1 -2) InEN Determine sup S and inf S. Solution. As for every n E N we have (-1)" (1- - )=1 - $1 it is clear that sup 5 hence 2(1 - sup S) -

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