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There are 462 subsets containing exactly 5 distinct elements

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There are 462 subsets containing exactly 5 distinct elements [#permalink] New post 21 Aug 2006, 13:26
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There are 462 subsets containing exactly 5 distinct elements of the set of letters {b,e,n,c,h,m,a,r,k,i,n,g}. Each of these subsets forms a unique chain of letters in which the letters are written in alphabetical order. If these 5-letter chains are written in alphabetical order, what is the last letter of the chain that occupies the 50th position?
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 [#permalink] New post 22 Aug 2006, 11:33
is the answer 'r' ? if it is correct, then I can explain the logic I used to arrive at the answer.
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  [#permalink] 22 Aug 2006, 11:33
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