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Identifique as sequências que representam progressões geométricas: *

(–3, 6, –12, 24, ...)

(3, 12, 48, 192, ...)

(2, 4, 6, 8, ...)

(400, 200, 100, 50, ...)

(20, 10, 0, –10, ...)

(1, 3, 5, 7, 9, ...)