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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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