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January 16th, 2015, 02:15 PM  #1 
Member Joined: Apr 2014 From: Missouri Posts: 39 Thanks: 1  Coefficient find in expansion of a term
Hi I just had this question. What is the coefficient of the term x^18 in the expansion of (x^5+x^2+x)^10. In the solve, they told to find the how x^18 can be formed with x^5, x^2 and x. Like 18= 2*5+8*1.........Now i understand why the sum should be 18 but why the summation of multiplier needs to be exactly 10 like the initial power? Why we can not have 18=3*5+3*1???????????? Thanks in advance 
January 17th, 2015, 02:47 PM  #2  
Global Moderator Joined: May 2007 Posts: 6,806 Thanks: 716  Quote:
 

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