when I input 6 it's wrong so is there another step that is maybe missing

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter10: Sequences, Series, And Probability
Section10.2: Arithmetic Sequences
Problem 51E
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when I input 6 it's wrong so is there another step that is maybe missing 

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