1.

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

Answer»

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

ANSWER :C


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