Question: ( 4 . ) ( 4 points ) It is known that the formula for the n th partial sum of some series k =

(4.)(4 points) It is known that the formula for the nth partial sum of some series k=1ak is Sn=2e-n+5-1n. Find the value of k=1ak
( 4 . ) ( 4 points ) It is known that the formula

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