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The numbers 1,2,3,…n are arranged in a r...

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

A

`(1)/(n!)`

B

`(k!)/(n!)`

C

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

D

`((n-k+1)!)/(n!)`

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The correct Answer is:
D
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