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find the number of ways of placing 4 marbles in 10 distinguishable boxes if the marbles are distinguishable, and no box can hold more than one marble

User Scubbo
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1 Answer

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We can place one marble in one of 10 boxes, another one in one of the remaining 9 boxes, etc.

Therefore, that number is
10\cdot9\cdot8\cdot7=5040.

User Adrian Garner
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