How do you use sigma notation to represent the series 1/2+1/4+1/8+…? Calculus Introduction to Integration Sigma Notation 1 Answer Wataru Sep 25, 2014 1/2+1/4+1/8+cdots=1/2^1+1/2^2+1/2^3+cdots=sum_{n=1}^infty1/2^n Answer link Related questions How does sigma notation work? Use summation notation to express the sum? What is sigma notation for an arithmetic series with first term a and common difference d ? How do you evaluate the sum represented by sum_(n=1)^5n/(2n+1) ? How do you evaluate the sum represented by sum_(n=1)^(8)1/(n+1) ? How do you evaluate the sum represented by sum_(n=1)^(10)n^2 ? What is sigma notation for a geometric series with first term a and common ratio r ? What is the value of 1/n sum_{k=1}^n e^{k/n} ? Question #07873 Question #117a3 See all questions in Sigma Notation Impact of this question 5745 views around the world You can reuse this answer Creative Commons License