Math

Which explains why the sequence 81,3,1/9,... is arithmetic or geometric?
I think it's geometric, but I not sure why It either because:

It decreases by 3 or It decreases by 1/27. I think it could be because it decreases 1/27.

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  1. Is it arithmetic?
    Is 3 - 81 = 1/9 - 3 ? , Nope, so it is not arithmetic

    Is it geometric?
    is 3/81 = (1/9) / 3 ? , Yes, so it is geometric

    to be arithmetic, there has to be a common "difference" between consecutive terms
    to be geometric, there has to be a common "ratio" between consecutive terms,
    which is true in your case, and that common ratio is 1/27

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    posted by Reiny
  2. Thank you Reiny! you are extremely helpful! Bless you and have a good day!

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