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![[Post New]](/templates/default/images/icon_minipost_new.gif) 11 Mar 2008 19:24:38 IST
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if Pr is the coefficient of xr in the expansion
(1+x)2(1+x/2)2(1+x/22)2(1+x/23)2......
prove that
Pr=22(Pr-1+Pr-2)/(2r-1)
and P4=1072/315
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