A) a, is divergent s-a ; n=1 2, k=1 a s, s = yss 1 s s 1 1 s s2 + + sn- s + t s t s asa, is divergent lim a, = 0 n-0 - = 0 s lim n-0 1 lim t, = lim s s a n-0 sh

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