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The numbers 1,2,3,.., n are arranged in ...

The numbers 1,2,3,.., n are arranged in a random order. The probability that the digits `1,2,3,..,k(n gt k)` appears as neighbours in that order is

A

`(1)/(n!)`

B

`(k !)/(n !)`

C

`((n-k)!)/(n!)`

D

none of these

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The correct Answer is:
D
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