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In an examination hall there are 'mn' ch...

In an examination hall there are 'mn' chairs in m rows and n columns the number of ways in which m students can be seated such that no row is vacant is

A

`m^(n) n!`

B

`n^(m) m!`

C

`m^(m) n!`

D

`n^(n) m!`

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The correct Answer is:
B
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