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![[Post New]](/templates/default/images/icon_minipost_new.gif) 29 Mar 2008 21:43:49 IST
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look if we select 1 form n that can be done in nC1 and if we select 2 it is
nc2 upto ncn
therefore no. of ways of selecting = nc1 +nc2+nc3------ncn
but we know that nc0 + nc1 + nc2 -----------ncn = 2^n
and here nC0 is missing and that is equal to 1
therefore nc1+ nc2 ---------------ncn = 2^n-1..
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I DONOT FOLLOW THE RULES I MAKE THEM TO FOLLOW ME. |
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