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Poleng_InLove

  • 2 years 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
    • 2 years ago
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    common difference = A2-A1 = A3-A2 = 11

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

  3. Poleng_InLove
    • 2 years ago
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    Hmm ...

  4. hartnn
    • 2 years ago
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    was that a yes or no ?? O.o

  5. Poleng_InLove
    • 2 years ago
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    Wait .

  6. hartnn
    • 2 years ago
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    waiting...

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

  8. hartnn
    • 2 years 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
    • 2 years ago
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    How can I find the n ?

  10. derek123
    • 2 years ago
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    why 4 again??

  11. hartnn
    • 2 years ago
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    common diff. always remains constant/same!

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

  13. hartnn
    • 2 years ago
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    n+1=4

  14. derek123
    • 2 years ago
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    n=5??

  15. hartnn
    • 2 years ago
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    is 5+1 = 4 ??

  16. Poleng_InLove
    • 2 years ago
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    n=3 ?

  17. hartnn
    • 2 years ago
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    yes. n=3 :)

  18. agent0smith
    • 2 years ago
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    Yep, common difference of 4 works here.

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

  20. hartnn
    • 2 years ago
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    \(\checkmark \)

  21. derek123
    • 2 years ago
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    haha i used this d = A2 - A1 = 4

  22. agent0smith
    • 2 years 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
    • 2 years ago
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    That's okay :))

  24. derek123
    • 2 years ago
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    WHAT IF THE COMMON DIFFERENCE IS 9??

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

  26. derek123
    • 2 years ago
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    OH WELL. xD

  27. hartnn
    • 2 years ago
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    did you ppl start learning sequences ??

  28. derek123
    • 2 years ago
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    yup,xD arithmetic seq and series and mean and geom seq and series

  29. derek123
    • 2 years ago
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    the formulae actually are mixing in my head. O_o

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

  31. agent0smith
    • 2 years 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
    • 2 years ago
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    nice "tutorial" :)

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