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It is neither.

(-6) - (-2) = -4

(-18) - (-6) = -12 which is not the same as -4.

Therefore it is not an arithmetic progression - which requires the difference between successive terms to be the same.

Also

-162/-54 = 3

-468/-162 = 2.88... recurring, and that is not the same as 3.

Therefore it is not a geometric progression - which requires the ratio of terms to be the same.

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Q: Is -2-6-18-54-162-468-1458 geometric or arithmetic
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