SOLUTION: 13. Please help with this math problem https://answers.yahoo.com/question/index?qid=20210419165930AAlPHLZ

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Question 1179193: 13. Please help with this math problem
https://answers.yahoo.com/question/index?qid=20210419165930AAlPHLZ

Answer by MathLover1(20850)   (Show Source): You can put this solution on YOUR website!

, , , ,,...


common difference is

your formula is:

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