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Write an explicit formula for the sequence 3,-9,27,-81
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4 votes
Write an explicit formula for the sequence 3,-9,27,-81

User David Fox
by
9.0k points

1 Answer

6 votes
The initial value is 3. The common ratio is -9/3 = -3. The general formula is
.. an = a1*r^(n-1)

So, for your values, ...
.. an = 3*(-3)^(n -1)
User Radovan Synek
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