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![[Post New]](/templates/default/images/icon_minipost_new.gif) 24 Dec 2007 22:32:38 IST
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1.There are n different books and p copies of each in a library.The number of ways in which one or more than one book be selected is ? ?2.In how many ways can the word 'arrange' be arranged such that neither 2 'r' nor 2'a' are allowed to come together ?
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