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

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 is

A

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

B

`(n-k+1)/(""^(n)C_k)`

C

`(n-k)/(""^(n)C_k)`

D

`(k!)/(n!)`

Text Solution

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The correct Answer is:
B
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