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1)A sequence is defined by Tn= Tn-2/Tn-1 for n>=3 with T1=20 and T2=2.

  1. Mar 4, 2008 #1
    1)A sequence is defined by Tn= Tn-2/Tn-1 for n>=3 with T1=20 and T2=2. find the 4th term.

    2) The general term of a sequence is Tn=2^n-2. Find n if Tn=1/128.

    What's the answer? Please help. Thanks.
     
    Last edited: Mar 4, 2008
  2. jcsd
  3. Mar 4, 2008 #2
    well, for the first one it is quite easy

    what is the 3rd term.

    T3=T1/T2, right? so the 4rth term would be T4=T2/T3, right?

    2) well all you need to do here is set 1/128=2^n-2 and solve for n? do you know how to do it?
     
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