In how many ways can \[mn\] letters be posted in \[n\] letter-boxes

1.	In how many ways can \[mn\] letters be posted in \[n\] letter-boxes
A.	\[{{(mn)}^{n}}\]
B.	\[{{m}^{mn}}\]
C.	\[{{n}^{mn}}\]
D.	None of these
Answer» D. None of these

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In how many ways can \[mn\] letters be posted in \[n\] letter-boxes

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