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Sigma Notation Problem

  1. Jul 15, 2010 #1
    Write the sum in expanded form.

    I don't know where to start with...
     

    Attached Files:

  2. jcsd
  3. Jul 15, 2010 #2

    berkeman

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    Staff: Mentor

    Is expanded form just writing it out?
     
  4. Jul 15, 2010 #3
    Previous ones, I solved them by expansion and getting a number as an answer.
    This one, I think maybe just expansion?...
     
  5. Jul 15, 2010 #4

    berkeman

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    Staff: Mentor

    Can you post an example of a previous one where you were able to solve for a numerical answer? And is there any more information about this problem? Any definition of f(x), or delta-x?
     
  6. Jul 15, 2010 #5
    The first two are the ones I solved.

    The book has no more information, just this one.
     

    Attached Files:

  7. Jul 15, 2010 #6

    berkeman

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    Staff: Mentor

    Hmm. Maybe others can see something we're missing, but I'd just write it out as a sum, showing the first few terms, then some ellipses, then the nth term. Do you submit the answer to an automated checking probram online, or send it to a human for checking? If it's an automated checker, you'd need to figure out how many terms before the ellipses it expects...
     
  8. Jul 15, 2010 #7
    My instructor will check the answer...I don't think I should use ellipses in the answer. Just expansion. I have no idea what to start with.
     
  9. Jul 15, 2010 #8

    Mark44

    Staff: Mentor

    This means to write the terms in the sum: f(x1)[itex]\Delta x_1[/itex] + f(x2)[itex]\Delta x_2[/itex] + and so on. Since n is not given, the usual practice is to write a few terms, then + ... + <last term>.
     
  10. Jul 15, 2010 #9

    Mark44

    Staff: Mentor

    Since you don't know n, you have to use an ellipsis in your answer.
     
  11. Jul 15, 2010 #10
    Oh, I see now, thank you all a lot. You are right, I will use ellipsis.
     
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