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

If `.^(n-1)C_r=(k^2-3)^nC_(r+1),` then k belongs to
(a) `(-oo,-2]`
(b) `[2,oo)`
(c) `[-sqrt3, sqrt3]`
(d) `[sqrt3,2]`

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