Question 1044046
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1.  The formula is written incorrectly.
    Fix and edit it.


2.  As I just said it to you in my previous post,  
         ( https://www.algebra.com/algebra/homework/Sequences-and-series/Sequences-and-series.faq.question.1044033.html )
    learn about the method of mathematical induction from the lessons

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/Sequences-and-series/Mathematical-induction-and-arithmetic-progressions.lesson>Mathematical induction and arithmetic progressions</A>

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/Sequences-and-series/Mathematical-induction-and-geometric-progressions.lesson>Mathematical induction and geometric progressions</A> 

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/Sequences-and-series/Mathematical-induction-for-sequences-other-than-arithmetic-or-geometric.lesson>Mathematical induction for sequences other than arithmetic or geometric</A> 

in this site.


Then try to solve this problem on your own.
It is the simplest problem on this method.
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