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 September 30th, 2016, 01:08 AM #1 Senior Member   Joined: Jul 2011 Posts: 405 Thanks: 16 Coefficient in binomial expansion The coefficients of $x^9$ in the expansion of $(1+x)(1+x^2)(1+x^3)...........(1+x^{2016})$ September 30th, 2016, 05:31 PM #2 Global Moderator   Joined: May 2007 Posts: 6,807 Thanks: 717 9=9 1+8=9 2+7=9 3+6=9 4+5=9 1+2+6=9 1+3+5=9 2+3+4=9 8 items Coefficient = 8. Expansion is not binomial! Tags binomial, coefficient, expansion Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Similar Threads Thread Thread Starter Forum Replies Last Post Furai Algebra 3 August 27th, 2016 01:45 PM Shen Algebra 1 January 17th, 2015 02:47 PM pikachu26134 Number Theory 3 July 26th, 2011 07:03 PM sunflower Number Theory 0 April 2nd, 2011 07:15 AM coolhandluke Applied Math 1 March 26th, 2010 04:55 PM

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