Decrease by 2, decrease by 1, double, Increase by one, repeat. (...25), 23, 22, 44, 45, 43, 42, 84, 85, 83, 82, ...
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11
The average mean is: (11+12+13+14+15)/5 = 13
6 - 13 - 2 - 12 - 7 - 14 = -42
12 13 14 * * * * * 12 + 13 + 14 = 39, not 45. The correct answer is 14, 15 and 16.
13