KingD6373 KingD6373

29-01-2024
Mathematics

contestada

"Working on something where I've encountered the following problem: I am given the Sn (Sum of n terms) which is 689, and I know that the first 3 terms are -7, 3, and 13. This gives me the a, -7, and the d, which is 10.
The problem is, all formulas I know and have tried re-arranging aren't working out very well.I don't know L.I don't know the N.
I've tried long-hand, adding all the numbers and came up with the 13th term being the desired 689. However, how do I get 13 with only the given information, not doing longhand as I did? What formula do I use, and re-arrange?

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