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Which describes this type of series?

-20 - 18 - 15 - 11 …
I think it is both arithmetic and geometric

  • math -

    differences of 2 , 3 , 4 so not arithmetic

    -20
    **** +2
    -18
    **** +3
    -15
    **** +4
    -11
    is it of form g + g r + g r^2 ....+gr^(n-1) ?
    -20 ( 1 + r + r^2 + .... r^(n-1) ) ?
    no way

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