how do you find a convergent subsequence where Sn = (-1) n(n+1) /2 ? wont Sn tend to negative infinity no matter what the subsequence is? thanks!
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Originally Posted by alexandrabel90 how do you find a convergent subsequence where Sn = (-1) n(n+1) /2 ? wont Sn tend to negative infinity no matter what the subsequence is? thanks! Yes...unless it is NOT -1 but rather or something like that. Check it, otherwise the question's pretty trivial. Tonio
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