Find the sum of n terms of the series 1+3+6+10+15... . Share with your friends Share 3 Rishabh Mittal answered this Dear Student , Here is the similar link for your query : https://www.meritnation.com/ask-answer/question/find-the-sum-to-n-terms-of-the-series-5-11-19-29/sequences-and-series/210468 We hope the above link will help you in clearing the doubt . Regards 2 View Full Answer