Diyadiya
  • Diyadiya
if in an A.P 3rd term is 18 and 17th term is 30. Sum of its 17 terms is: (I'm not getting the right answer)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
jamiebookeater
  • jamiebookeater
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Diyadiya
  • Diyadiya
3rd Term= a+2d 17thTerm=a+16d
experimentX
  • experimentX
18 = a+2d; 30 =a+16d solve them, find a and d, use in formula of Sn to get value http://www.wolframalpha.com/input/?i=18+%3D+a%2B2d%3B+30+%3Da%2B16d
Diyadiya
  • Diyadiya
Ok so solution given in my book is wring :)

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experimentX
  • experimentX
http://www.wolframalpha.com/input/?i=17%2F2%282*114%2B16*6%2F7%29
Callisto
  • Callisto
3rd Term= a+2d =18 -(1) 17thTerm=a+16d =30 -(2) (2)-(1) 14d = 12 d = 12/14 = 6/7 a + 2(6/7) =18 a = 114/7 Sum = (114/7 + 30) x17 /2 = something ugly :S
experimentX
  • experimentX
i think we should have a calculator applet
Diyadiya
  • Diyadiya
Yup! Something ugly But the answer given in the book was 612 So its wrong =) Thank you :)
anonymous
  • anonymous
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anonymous
  • anonymous
... isn't that ugly ? LOL
Diyadiya
  • Diyadiya
Definitely :)

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