SOLUTION: use S(n)=a1 (1−rn ) / (1−r) to evaluate the series 1/3+1/9+1/27+1/81

Question 873298: use S(n)=a1 (1−rn ) / (1−r) to evaluate the series 1/3+1/9+1/27+1/81
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!



Hi

r = 1/3

 when |r| < 1, r^n is VERY small

  

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SOLUTION: use S(n)=a1 (1&#8722;rn ) / (1&#8722;r) to evaluate the series 1/3+1/9+1/27+1/81

SOLUTION: use S(n)=a1 (1−rn ) / (1−r) to evaluate the series 1/3+1/9+1/27+1/81