Word Count : 80

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Let (s_n=\sum_{k=1}^n a_k) denote the (n)-th partial sum. Convergence of the series (\sum _____ ___ _________ ______ _________.
__________ __________ ______ _______ _________ ________ _______.
______ _________ ____ _____ __________ _________ ___ _______ __________.
__________ _________ ______ _________ _________ _______ ___ _____ __________ ________.
____ ____ ______ __________ _________ ______ _________ ________.
________ _____ ______ ________ __________ _____ ___ _______ ______.
________ ____ ________ __________ ________ _______.
_______ _________ ______ ___ _______.
___ ____ ___ __________ _____ ______.
_______ _________.
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