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Evaluate if the followings are Cauchy sequences or not. (a) an= (-1)n (b) an= (-1)n/n (c) an =...

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Advance Math

Evaluate if the followings are Cauchy sequences or not.

(a) an= (-1)n

(b) an= (-1)n/n

(c) an = n/(n+1)

(d) an = (cos n)/n

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