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(i) If ""^(2n)C(3) : ""^(n)C(3)= 11 : ...

(i) If `""^(2n)C_(3) : ""^(n)C_(3)= 11 : 1`, find n.
(ii) If `""^(2n)C_(3) : ""^(n)C_(2) = 12 : 1`, find n.

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