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Each number is multiplied by negative 2 to get the next number. 5 x -2 = -10 -10 x -2 = 20 20 x -2 = -40 -40x -2 = 80 So the next logical number in the series 5 10 20 -40 would be 80.

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โˆ™ 2009-03-08 14:47:05
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Q: What is the next logical number 5 -10 20 -40?
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