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1 December, 00:16

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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  1. 1 December, 00:39
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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.
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