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Math Help - Geometric sequences

  1. #1
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    Geometric sequences

    I'm really troubled with this question. Can anybody help?
    "If we have a geometric sequence with initial term a and ratio r, then is the formula for the ninth term of the corresponding geometric series is given by
    s_n = a 1-r/1-r^n ?"
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  2. #2
    Air
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    Quote Originally Posted by 14041471 View Post
    I'm really troubled with this question. Can anybody help?
    "If we have a geometric sequence with initial term a and ratio r, then is the formula for the ninth term of the corresponding geometric series is given by
    s_n = a 1-r/1-r^n ?"
    The geometric sequence formula is S_n= a\frac{1-r^n}{1-r}.

    You should have a constant value of the initial term and the ratio thus to find the ninth term, you will set n=9.
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