Question 1174212
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Hello, in your post, you INCORRECTLY use the suffix " th ",

making a grammatical error.



The problem was solved at this forum one-two weeks ago under this link


<A HREF=https://www.algebra.com/algebra/homework/Sequences-and-series/Sequences-and-series.faq.question.1173732.html>https://www.algebra.com/algebra/homework/Sequences-and-series/Sequences-and-series.faq.question.1173732.html</A>


https://www.algebra.com/algebra/homework/Sequences-and-series/Sequences-and-series.faq.question.1173732.html




By the way, that previous post was symbol-by-symbol the same as your current post 
with the same formatting and with the same grammatical errors.



It creates/induced some thoughts in my head . . .