Find the number of r-permutations of the multiset
{??1, ??2, … , ???} such that in
every...
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Find the number of r-permutations of the multiset{??1, ??2, … , ???} such that in every such permutation each type of an element of the multisetappears at least once. (You do not need to provide a short answer. Assume r ?n.)
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Let us consider that the number of rcombinations of themultiset is Let xj be the number of occurrences of aj where 1jk Then weneed to find the number of solutions of the equation is1in the nonnegative integers
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