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October 28th, 2010, 01:21 PM  #1 
Member Joined: Oct 2010 Posts: 30 Thanks: 0  very hard question
could someone help with this please, Let k be a nonnegative integer. How many distinct integervalued vectors (n1, n2, . . . , nr) are there which satisfy both of the following constraints? • nj ?k for all j=1,2,...,r and • n1 + n2 + · · · + nr = n. 

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