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OpenStudy (anonymous):
HELP PLEASE, WILL REWARD! What is the sum of the finite arithmetic series? (-10)+0+10+20+...+130
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OpenStudy (mathmale):
While I don't remember the formula for the "sum of an arithmetic sequence," I'm sure that such formula could be found easily by doing an Internet search for that term. I do see that each term of your series is obtained by adding 10 to the previous term. Please look for the formula for the finite sum of an arithmetic series and see whether you can finish the solution of this problem on your own.
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