I'm trying to find the number of terms in the arithmetic series which makes the sum strictly greater than . I know that , but I somehow can't apply it to this problem.
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Originally Posted by Captcha I'm trying to find the number of terms in the arithmetic series which makes the sum strictly greater than . I know that , but I somehow can't apply it to this problem. You know a_1 and d. Set S_n=18,000 and solve for n.
Originally Posted by Jameson You know a_1 and d. Set S_n=18,000 and solve for n. 3 terms?
Almost. You subtracted 7 but should have added.
Originally Posted by Jameson Almost. You subtracted 7 but should have added. Oh, silly mistake. terms then?
Seems to make sense.
Many thanks!
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