In a sequence, the ratio of the third term to the second term is the one successive from the ratio of the second to the first.
The successive ratios are : u2/u1, u3/u2, u4/u3 and so on.
In a geometric sequence, these would all be the same.
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The ratio between successive numbers must be a constant.
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A descending geometric sequence is a sequence in which the ratio between successive terms is a positive constant which is less than 1.
Cumulative frequency
There is no conclusion to the Fibonacci sequence - it continues on infinitely. The conclusion is that successive terms tend to a constant ratio with one another. So if a is one term, the next is ar and the one after that is ar2. Then from the rule that any term is the sum of the previous two, ar2=ar +a, which means r2-r-1=0 so r =(1+sqrt5)/2 (the golden ratio). There is no end to this series.