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[" If "n-1C(r)=(K^(2)-3)(^(n)C(r+1))],["...

[" If "n-1C_(r)=(K^(2)-3)(^(n)C_(r+1))],[" then "K" belongs to "],[[" (A) "[-sqrt(3),sqrt(3)]],[" (B) "(-oo,-2)]]

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