SOLUTION: What is the explicit formula for this sequence: {9, 3, 1, 1/3...}? I know that the common ration is divide 3 but I am confused on how to find the formula. I said. "An=3(n)+27."

Algebra ->  Formulas -> SOLUTION: What is the explicit formula for this sequence: {9, 3, 1, 1/3...}? I know that the common ration is divide 3 but I am confused on how to find the formula. I said. "An=3(n)+27."      Log On


   

Question 509637: What is the explicit formula for this sequence: {9, 3, 1, 1/3...}?
I know that the common ration is divide 3 but I am confused on how to find the formula. I said. "An=3(n)+27."
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
you're right about the divide 3

An = 27 / (3^n) ___ An = (3^3) / (3^n) ___ An = 3^(3 - n)