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

If `^n-1C_r=(k^2-3)^n C_(r+1),then k in `

A

`(-oo,-2)`

B

`(2,oo)`

C

`[-sqrt3, sqrt3]`

D

`[sqrt3, 2]`.

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