k(k + 1) 2 + (k+ 1) = (k+ 1)(k + 2) 2
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter10: Sequences, Series, And Probability
Section10.1: Infinite Sequences And Summation Notation
Problem 20E
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please explain how the first part was simplified to the second part.
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