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## Homework Statement

In a Geometric Sequence find t

_{10}. t

_{3 }= 4 and t

_{6}= 4/27

Give a recursive definition for the sequence: 1, 4, 13, 40....

## Homework Equations

I know that a Geometric sequence is: t

_{n}=t

_{1}(r)

^{n-1}

And that a recursive formula starts off with t

_{n-1}

I'm not sure where to go from here...