Use summation notation to express the sum? Calculus Introduction to Integration Sigma Notation 1 Answer Wataru Nov 3, 2014 #a_1+a_2+a_3+cdots+a_n=sum_{i=1}^n a_i# I hope that this was helpful. Answer link Related questions How does sigma notation work? How do you use sigma notation to represent the series #1/2+1/4+1/8+…#? 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 4663 views around the world You can reuse this answer Creative Commons License