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Adam1994

find the sum of the arithmetic sequence having the data given. a1 = 5, an = 3, n = 20

  • 2 years ago
  • 2 years ago

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  1. Chlorophyll
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    Do you know which formula to apply?

    • 2 years ago
  2. Adam1994
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    I have no idea, I missed a few days of class and I came back to a whole new lesson. Kinda just tryin to get caught up right now

    • 2 years ago
  3. Chlorophyll
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    S_n = n ( a_1 + a_n ) / 2

    • 2 years ago
  4. ngocthi0101
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    chloro right

    • 2 years ago
  5. Chlorophyll
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    Do you know how to plug in?

    • 2 years ago
  6. Adam1994
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    nuh uh :/

    • 2 years ago
  7. Chlorophyll
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    Try a1 = ?

    • 2 years ago
  8. ngocthi0101
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    that easy

    • 2 years ago
  9. ngocthi0101
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    i can prove formula

    • 2 years ago
  10. Chlorophyll
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    Just go step by step!

    • 2 years ago
  11. ngocthi0101
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    no, sum sequense have formula, not step by step

    • 2 years ago
  12. Chlorophyll
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    @Adam1994 pls let me know a1?

    • 2 years ago
  13. Adam1994
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    a1=5

    • 2 years ago
  14. Chlorophyll
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    a_n?

    • 2 years ago
  15. ngocthi0101
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    ok, i know a litle english

    • 2 years ago
  16. Adam1994
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    a_n = 3

    • 2 years ago
  17. Chlorophyll
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    Would you double check this problem, I believe it's wrong!

    • 2 years ago
  18. Chlorophyll
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    Since n = 20 => we're looking for S_20

    • 2 years ago
  19. Chlorophyll
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    S_20 = 20 ( a_1 + a_20 ) / 2

    • 2 years ago
  20. Chlorophyll
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    Anyway, this is the formula for arithmetic Sum, just memorize it for your own benefit!

    • 2 years ago
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