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30 July, 20:19

Which formula can be used to describe the sequence below?

27,9,3,1,1/3

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  1. 30 July, 20:48
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    This is a geometric sequence with an initial term of 27 and a common ratio of 1/3

    This just means that each term is 1/3 the term preceding it.

    Any geometric sequence can be expressed as:

    a (n) = ar^ (n-1), a=initial term, r=common ratio, n=term number in this case:

    a (n) = 27 (1/3) ^ (n-1)
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