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

asked May 5, 2017 91.8k views

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4 votes

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

Gene Karasev answered May 10, 2017

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