Search for: If a>0 and coefficient of x2, x3, x4 in the expansion of 1+xa6 are in A.P., then a equals If a>0 and coefficient of x2, x3, x4 in the expansion of 1+xa6 are in A.P., then a equals A(4+7)3B(4+3)3C2−3D2+3 Fill Out the Form for Expert Academic Guidance!l Grade ---Class 1Class 2Class 3Class 4Class 5Class 6Class 7Class 8Class 9Class 10Class 11Class 12 Target Exam JEENEETCBSE +91 Preferred time slot for the call ---9 am10 am11 am12 pm1 pm2 pm3 pm4 pm5 pm6 pm7 pm8pm9 pm10pm Please indicate your interest Live ClassesBooksTest SeriesSelf Learning Language ---EnglishHindiMarathiTamilTeluguMalayalam Are you a Sri Chaitanya student? NoYes Verify OTP Code (required) I agree to the terms and conditions and privacy policy. Solution:Coefficient of xr in the expansion of (1+x/a)6=6Cr(1/a)r According to given condition 6C2(1/a)2,6C3(1/a)3,6C4(1/a)4are in A.P.∴ 2 6C31a3=6C21a2+6C41a4⇒ 2(20)a=15a2+1⇒ 3a2−8a+3=0⇒ a=(4+7)3 as a>0. Related content Top 5 Reasons To Study Science After 10th Application for Teaching Job Railway Jobs After 10th CBSE Class 12 Computer Science Answer Key and Paper Analysis 2024 – Student Feedback and Expert View Fractions Class 6 Worksheet Genetics and Evolution | Mind Map Kerala NEET UG Merit List 2023 NEET Exam Centres in Hyderabad 2024 Ecology & Environments NEET Exam Centres in Maharashtra 2024