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Summations problem

  1. Aug 31, 2012 #1
    1. The problem statement, all variables and given/known data
    Sum all the whole numbers which are multiples of 5 from 5 to 1550


    2. Relevant equations



    3. The attempt at a solution
    1550÷5=310
    1550-5x310= 478950
     
  2. jcsd
  3. Aug 31, 2012 #2

    LCKurtz

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    Hint: Sum of arithmetic progression or, alternatively,$$
    \sum_{k=1}^{310}5k = 5\sum_{k=1}^{310}k$$
     
  4. Sep 1, 2012 #3

    HallsofIvy

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    Yes, that is correct

    No, 1550- 5x 310= 0, That is what [tex]1550÷5= 310[/tex] means!
     
  5. Sep 1, 2012 #4

    Bacle2

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    She is using the parentheses differently (incorrectly so , by priority of operations):

    1550-5=1545 , 1545x310= 474950
     
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