10-09-2016
Mathematics

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4 -12 36 -108 324 what's the rule

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10-09-2016

Hello,
[tex]u_{1}=4\\ u_{2}=4*3=12\\ u_{3}=4*3^2=36\\ u_{4}=4*3^3=108\\ ...\\ \boxed{u_{n}=4*{n-1}}\\[/tex]

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