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14-10-2016
Mathematics

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what is the next number after 3 -6 12 4 20

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nobillionaireNobley nobillionaireNobley

15-10-2016

The sequence is alternatingly decreasing and increasing.
3 - 9 = -6
-6 + 18 = 12
12 - 8 = 4
4 + 16 = 20

Therefore, next term will be:
20 - 7 = 13

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