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Out of (2n+1) tickets consecutively numb...

Out of (2n+1) tickets consecutively numbered, three are drawn at random. Find the chance that the numbers on them are in AP.

A

`n/(n^2-1)`

B

`(3n)/(n^2-1)`

C

`(3n)/(4n^2-1)`

D

`(3n)/(4n^2+2n-1)`

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