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In how many ways can 5 letters be posted in 4 postboxes if each postboxes can contain any number of letters ?
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In how many ways can 5 letters be posted in 4 postboxes if each postboxes can contain any number of letters ?

User Hugomg
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this may be permutations! by using the formula nPr..
this case use 5P4 instead. hope this is correct!
so answer is 120.
User Siddhesh
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