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  • Jun 2, 2010, 03:24 PM
    swood
    find equation for sequence
    What is the equation for the sequence -5, 10, -15, 20, -25, 30..
  • Jun 3, 2010, 03:26 AM
    Unknown008

    First, you can see that the term changes sign each time. This means that it is multiplied by a negative number each time.

    Then, you see only multiples of 5...

    This means that the pattern is as such:

    5 x -1
    5 x 2
    5 x -3
    5 x 4
    5 x -5
    5 x 6

    When you multiply 5 by odd numbers, you add the negative sign, and when it's an even number, you put the positive sign. Post what you get for the next term :)

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