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Math Help - Arithmatic/Geomatrix Progression

  1. #1
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    Arithmatic/Geomatrix Progression

    For the following sequence of numbers, write down their corresponding difference equations, determine u15 and indicate the kind of sequences they represent:
    A) 3000, -1500,750,-375,187..
    B)50,47,44,41,38...


    I understand that for these kind of problem that we can use either n= 0,1... or n=1,2...

    As it is not indicated in the question, I use n=0,1,2... for both the question

    After I am done, I checked the answer and realise that I am right for B but not A.

    In part a, the answer given used n=1,2 hence their n15 and my n15 is different

    My question is.. when do we know when to use n=0,1,2 or n=1,2,3? I thought we can use any one of it we like? Is it the question fault that it did not indicate?
    Thanks in advance
    ps exam in 10hrs
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  2. #2
    Super Member wingless's Avatar
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    If the question doesn't state to start the sequence from 0, starting from 1 is nearly always correct.
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  3. #3
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    hmm but in this past year paper,
    a ) they used n = 1,2,3,4
    b ) they used n = 0,1,2,3

    isnt this just.. weird?
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