1 votes 1 votes The coefficient of $x^6y^3$ in the expression $(x+2y)^9$ is $84$ $672$ $8$ none of these Combinatory isi2017-dcg combinatory binomial-theorem + – gatecse asked Sep 18, 2019 • recategorized Nov 15, 2019 by Lakshman Bhaiya gatecse 607 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.
3 votes 3 votes The answer is option b :672 Using above formula if you put k=3 you will get value as 672 swatiraoo45# answered Dec 24, 2019 swatiraoo45# comment Share Follow See all 2 Comments See all 2 2 Comments reply Falahamin commented Jun 29, 2020 reply Follow Share shouldn't the answer be 84? coefficient of x^6y^3 will be 9C6 by binomial theorem which is equal to 21/2. also we need to multiply the result with 2^3 as it is coefficient of y which in turn gives us 84. 0 votes 0 votes hello_manish commented Nov 1, 2021 reply Follow Share No bro u r wrong... 9C6 = (9*8*7)/(3*2*1)=9C3 =84 and multiply 84 with 8= 672 is Ans 0 votes 0 votes Please log in or register to add a comment.