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Math Help - factorials

  1. #1
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    factorials

    im not sure if this is trig or precal. for factorial a_n = (2n)! what does a_n+1 = ?
    i thought you just add 1 to the end and get (2n+1)! but its not...
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by jeph View Post
    im not sure if this is trig or precal. for factorial a_n = (2n)! what does a_n+1 = ?
    i thought you just add 1 to the end and get (2n+1)! but its not...
    I'll assume that we are after a_{n+1}, so we have:

    a_n = (2n)!

    so:

    a_{n+1} = (2(n+1))! = (2n+2)!

    RonL
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  3. #3
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by jeph View Post
    im not sure if this is trig or precal. for factorial a_n = (2n)! what does a_n+1 = ?
    i thought you just add 1 to the end and get (2n+1)! but its not...
    a_n = (2n)!

    a_n+1 = (2(n+1))! = (2n + 2)!


    EDIT: You're too quick for me Captain!
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