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    arbee's Avatar
    arbee Posts: 2, Reputation: 1
    New Member
     
    #1

    Feb 8, 2011, 06:24 PM
    sequence euation
    the givn is 3 -6 12 -24 find the sequence equation
    arbee's Avatar
    arbee Posts: 2, Reputation: 1
    New Member
     
    #2

    Feb 8, 2011, 06:26 PM
    what is the sequence equation of 3, -6, 12, -24
    jcaron2's Avatar
    jcaron2 Posts: 986, Reputation: 204
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    #3

    Feb 8, 2011, 07:39 PM

    Each number is -2 times the previous. So you know it'll be something like

    ,

    where is the nth term and c is some constant that you have to figure out. It's simple enough to figure out what c is: just plug in the values for the first number.







    So



    or to simplify a little more



    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #4

    Feb 9, 2011, 06:46 AM

    It is rather obvious that the numbers are multiples of 3.

    Try

    What's the next number?

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