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If (n-1)Cr=(k^2-3)nC(r+1),then k belong...

If `(n-1)C_r=(k^2-3)nC_(r+1)`,then k belong to

A

`(-oo,-2)`

B

`2, +oo)`

C

`[- sqrt 3, sqrt3]`

D

`(sqrt 3, 2)`

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