How many terms of the AP: 9, 17, 25, … must be taken to give a sum of 636. Table of Contents<Select Specifically4.How many terms of the AP: 9, 17, 25, … must be taken to give a sum of 636.Tags: CBSE Solution Previous Given, l = 28, S = 144, and there are total 9 terms. Find a. Next Show that a1, a2,…, an form an AP where an is defined as below.an = 9 – 5n. Also, find the sum of the first 15 terms in each case. Leave a Reply Cancel replyCommentEnter your name or username to commentEnter your email address to commentEnter your website URL (optional) Save my name, email, and website in this browser for the next time I comment. Sign me up for the newsletter!