x +x2+..+ xn Let 0< a is convergent, show that < b, > is convergent or divergent (2)Let is convergent, show that is convergent or divergent (3)ls there any such that , < bn > are both diverge?

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Sequence and Series

A sequence is defined as a collection of things. Series is defined to sum the things one by one in the sequence.  It was invented by German mathematician Carl Friedrich Gauss.