Find the sum of first 17 terms of an AP whose 4th and 9th terms are -15 and -30 respectively. Find the sum of first 17 terms of an AP whose 4th and 9th terms are -15 and -30 respectively. November 23, 2020 Category: Chapter 5 - Arithmetic Progressions , Maths , NCERT Class 10 , Facebook Messenger WhatsApp Share this:TwitterFacebook Related