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Poleng_InLove

  • one year ago

There are three terms in Arithmetic Sequence . The common difference is 11 . A1=n-5 , A2=n-1 , and A3=2n . What are the terms ?

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  1. hartnn
    • one year ago
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    common difference = A2-A1 = A3-A2 = 11

  2. hartnn
    • one year ago
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    A3-A2 = 11 2n - (n-1) =11 can you find 'n' from here ??

  3. Poleng_InLove
    • one year ago
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    Hmm ...

  4. hartnn
    • one year ago
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    was that a yes or no ?? O.o

  5. Poleng_InLove
    • one year ago
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    Wait .

  6. hartnn
    • one year ago
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    waiting...

  7. agent0smith
    • one year ago
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    A2 - A1 = 11 (n - 1) - (n -5) = 11 -1 + 5 = 11 no. 4 does not equal 11.

  8. hartnn
    • one year ago
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    ok...i guess, 11 as common difference(d) should naot have been given. in that case d = A2 - A1 = 4 then A3-A2 = 4 and find 'n'.

  9. Poleng_InLove
    • one year ago
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    How can I find the n ?

  10. derek123
    • one year ago
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    why 4 again??

  11. hartnn
    • one year ago
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    common diff. always remains constant/same!

  12. hartnn
    • one year ago
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    2n - (n-1) =4

  13. hartnn
    • one year ago
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    n+1=4

  14. derek123
    • one year ago
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    n=5??

  15. hartnn
    • one year ago
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    is 5+1 = 4 ??

  16. Poleng_InLove
    • one year ago
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    n=3 ?

  17. hartnn
    • one year ago
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    yes. n=3 :)

  18. agent0smith
    • one year ago
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    Yep, common difference of 4 works here.

  19. Poleng_InLove
    • one year ago
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    n-5=-2 n-1=2 2n=6

  20. hartnn
    • one year ago
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    \(\checkmark \)

  21. derek123
    • one year ago
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    haha i used this d = A2 - A1 = 4

  22. agent0smith
    • one year ago
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    Note that we can't guarantee these are the correct answers, since... the question claims the difference is 11. Either that's wrong, or you didn't write out the question correctly.

  23. Poleng_InLove
    • one year ago
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    That's okay :))

  24. derek123
    • one year ago
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    WHAT IF THE COMMON DIFFERENCE IS 9??

  25. hartnn
    • one year ago
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    from d = A2 - A1 the common diff. must be 4 cannot be anything else.

  26. derek123
    • one year ago
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    OH WELL. xD

  27. hartnn
    • one year ago
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    did you ppl start learning sequences ??

  28. derek123
    • one year ago
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    yup,xD arithmetic seq and series and mean and geom seq and series

  29. derek123
    • one year ago
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    the formulae actually are mixing in my head. O_o

  30. hartnn
    • one year ago
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    then going through this might be helpful....http://openstudy.com/users/hartnn#/updates/503bb2a0e4b007f9003103b0

  31. agent0smith
    • one year ago
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    \[\large{\color{Blue}{T}\color{Yellow}{U}\color{Magenta}{T}\color{Pink}{O}\color{MidnightBlue}{R} I\color{Blue}{A}\color{Green}{L}!}\] ^^ Is it a tutorial on how to have a seizure? :P

  32. amistre64
    • one year ago
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    nice "tutorial" :)

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