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What is the next number ? in this pattern 3, -6, 12, 4, 20, ?
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What is the next number ? in this pattern 3, -6, 12, 4, 20, ?

User Uingtea
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3 - 9 = -6
-6 + 9*2 = 12
12 - 8 = 4
4 + 2*8 = 20
20 - 7 = 13
13 + 2*7 = 27
User Abrown
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