Results 1 to 2 of 2

Math Help - sequences

  1. #1
    Junior Member
    Joined
    Jan 2009
    Posts
    32

    Exclamation sequences

    .
    Last edited by mathh18; January 30th 2010 at 03:30 PM.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Jester's Avatar
    Joined
    Dec 2008
    From
    Conway AR
    Posts
    2,347
    Thanks
    30
    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.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Convergence in sequences of sequences
    Posted in the Differential Geometry Forum
    Replies: 4
    Last Post: October 19th 2010, 07:28 AM
  2. Sequences and the sequences' arithmetics
    Posted in the Differential Geometry Forum
    Replies: 1
    Last Post: October 6th 2010, 09:31 PM
  3. Monotone sequences and Cauchy sequences
    Posted in the Differential Geometry Forum
    Replies: 3
    Last Post: March 21st 2009, 08:59 PM
  4. Sequences Q3
    Posted in the Calculus Forum
    Replies: 1
    Last Post: March 9th 2009, 05:08 AM
  5. Replies: 5
    Last Post: January 16th 2008, 04:51 PM

Search Tags


/mathhelpforum @mathhelpforum