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![[Post New]](/templates/default/images/icon_minipost_new.gif) 26 Dec 2007 16:15:58 IST
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There are 'm' copies each of 'n' different booksin a university library.The number of ways in which 1 or more than 1 book can be selected is.......................
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26 Dec 2007 16:23:28 IST
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for first buk dere r (m+1) ways to select a buk (copy) (including no selection)
similarly (m+1) 4 the other
and for the rest n buks too
hence total no of ways of selecting buks is
(m+1)(m+1)(m+1).....ntimes
= (m+1)^n
but atleast one buk is to be selected
hence total no of ways is
(m+1)^n - 1.
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