masterspaz Posted October 5, 2008 Share Posted October 5, 2008 find in (1+x+x^2)(1+x)^n the coefficient of (a) x^7 (b)x^8; and © x^r for 0<=r<=n+2 i've no idea wher to start this one Link to comment Share on other sites More sharing options...
drufae Posted October 6, 2008 Share Posted October 6, 2008 I think this question uses the same thechniques as the one I posted (see combinatorics problem in homework help) if you come up with anything please tell me. Link to comment Share on other sites More sharing options...
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