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If ^n-1Cr=(k^2-3)^n C(r+1),t h e nk in ...

If `^n-1C_r=(k^2-3)^n C_(r+1),t h e nk in ` `(-oo,-2]` b. `[2,oo)` c. `[-sqrt(3),sqrt(3)]` d. `(sqrt(3),2]`

A

`(oo, -2]`

B

`[2, oo)`

C

`[-sqrt3, sqrt3]`

D

`(sqrt3, 2]`

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The correct Answer is:
D
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