BlueBookWard BlueBookWard

17-11-2016
Mathematics

contestada

How do I write an explicit formula for this sequence? 2, 6, 18, 54, 162, ... I already know the common difference is x3.

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estherakinali estherakinali

21-11-2016

If the common difference is 3 all you need to do is:
an=a1 - d(n-1)
2 - 3d + 3
Explicit rule = -3n + 5

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