Search for: Let an=∑r=0n 1 nCr2 and bn=∑r=0n (n−r) nCr2then bn equals Let an=∑r=0n 1 nCr2 and bn=∑r=0n (n−r) nCr2then bn equals AanBnanCn2anD0 Register to Get Free Mock Test and Study Material Grade ---Class 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 pm10pmPlease indicate your interest Live ClassesRecorded ClassesTest SeriesSelf LearningVerify OTP Code (required) I agree to the terms and conditions and privacy policy. Solution:We havebn=∑r=0n n−r nCr2=∑r=0n n−r nCn−r2=∑r=0n r nCr2Thus, bn+bn=∑r=0n n−rnCr2+∑r=0n rnCr2=n∑r=0n 1 nCr2=nan⇒ bn=n2anRelated content CWSN Full Form – Children With Special Needs CAA Full Form – Citizenship Amendment Act TET Full Form – Teacher Eligibility Test NCERT Books for Class 10- Download Free PDF (2023-2024) NCERT Books for Class 11- Download Free PDF (2023-2024) USA Full Form – United States of America NRC Full Form – National Register of Citizens Distance Speed Time Formula Refractive Index Formula Mass Formula