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The number of multi sets of size $4$ are possible with the elements of the set $S= \{1,2,3,4,5,6\}$ is ________ .
in Set Theory & Algebra by Junior (561 points)
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Multiset can contain duplicate elements, therefor for each position (total 4 positions) we have 6 choices.
Therefore total number should be 6*6*6*6 = 64

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