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Anonymous
Each number is three times the previous number.
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It is 3 followed by 1
243, -729, 2187
81 / 3 = 27
81 = 3 x 27
9 243 - 81 = 162 81 - 27 = 54 162 = 54 * 3 54 = 18 * 3 27 - 18 = 9