Question

Transcribed Image Text:Suppose that ak > 0 for all k e N and E ak < 0. For each of the
following, prove that the given series converges.
ak
( a ) ΣΕΙ
1+ k3ak
(b) Lk=1 1+ ak
Vak
(c) Ek=1 k
< 0o.
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