1 votes 1 votes The coefficient of $x^{17}$ in the expansion of $(x^2 + x^3 + x^4 + x^5)*(x^3 + x^4 + x^5 + x^6)*(x^4 + x^5 + x^6 + x^7).$ Combinatory combinatory generating-functions + – raun220 asked Jul 6, 2017 • edited Nov 26, 2019 by KUSHAGRA गुप्ता raun220 402 views answer comment Share Follow See all 2 Comments See all 2 2 Comments reply joshi_nitish commented Jul 6, 2017 reply Follow Share yes it is 3.. x^4x^6x^7 + x^5x^5x^7 + x^5x^6x^7, these three terms are making x^17 in above expansion.. 1 votes 1 votes raun220 commented Jul 6, 2017 reply Follow Share thank you is there any general formula for finding the coefficient of x^n apart from picking up random value and checking. 0 votes 0 votes Please log in or register to add a comment.
Best answer 5 votes 5 votes #Generating_Functions Manu Thakur answered Jul 7, 2017 • selected Jul 7, 2017 by raun220 Manu Thakur comment Share Follow See all 0 reply Please log in or register to add a comment.