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Thread: sequences

  1. January 30th 2010, 03:03 PM #1
    mathh18
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    Exclamation sequences

    .
    Last edited by mathh18; January 30th 2010 at 03:30 PM.
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  2. January 30th 2010, 03:17 PM #2
    Danny
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    Quote Originally Posted by mathh18 View Post
    can anyone help write a closed formula for any of these?
    1, 7, 13, 19, 25...

    2, 10, 50, 250, 1250...

    -3, 5, 17, 33, 53...

    i'm stuck on all three of these, any help would be great thank you so so so much!
    1) common difference is 6 - try a_n = 6n+k and find k that works.

    2) Dividing shows the same number - 5, try a_n = c_1 5^n + c_2

    3) the difference is 8, 12, 16, 20 and then again is 4 which suggests a formula of the form a_n = pn^2+qn+r - find p,q and r.
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