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![[Post New]](/templates/default/images/icon_minipost_new.gif) 6 Mar 2008 16:55:29 IST
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the given expression is the expansion of e ( 1+ x + x2) . this can be written as e exex2
This can be expanded as e ( 1+ x + x2 /2 ! + x3 / 3! + x4 / 4!.....) ( 1 + x2 + x4/2! + x6/3!...)
coefficient of x4 is e/ 4! + e/ 2! + e / 2! = e/24 + e = 25e/24
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